diff --git a/.gitignore b/.gitignore
index bd3a7c8..f2f22ba 100644
--- a/.gitignore
+++ b/.gitignore
@@ -1,2 +1,3 @@
-book
+en/book
+zh-CN/book
 .DS_Store
diff --git a/assets/CNAME b/en/assets/CNAME
similarity index 100%
rename from assets/CNAME
rename to en/assets/CNAME
diff --git a/en/assets/custom.js b/en/assets/custom.js
new file mode 100644
index 0000000..6fd7c44
--- /dev/null
+++ b/en/assets/custom.js
@@ -0,0 +1,104 @@
+(function() {
+    var path = window.location.pathname;
+    if (path.endsWith("/print.html")) {
+        return;
+    }
+
+    var images = document.querySelectorAll("main img")
+    Array.prototype.forEach.call(images, function(img) {
+        img.addEventListener("click", function() {
+            BigPicture({
+                el: img,
+            });
+        });
+    });
+
+    // Un-active everything when you click it
+    Array.prototype.forEach.call(document.getElementsByClassName("pagetoc")[0].children, function(el) {
+        el.addEventHandler("click", function() {
+            Array.prototype.forEach.call(document.getElementsByClassName("pagetoc")[0].children, function(el) {
+                el.classList.remove("active");
+            });
+            el.classList.add("active");
+        });
+    });
+
+    var updateFunction = function() {
+
+        var id;
+        var elements = document.getElementsByClassName("header");
+        Array.prototype.forEach.call(elements, function(el) {
+            if (window.pageYOffset >= el.offsetTop) {
+                id = el;
+            }
+        });
+
+        Array.prototype.forEach.call(document.getElementsByClassName("pagetoc")[0].children, function(el) {
+            el.classList.remove("active");
+        });
+
+        Array.prototype.forEach.call(document.getElementsByClassName("pagetoc")[0].children, function(el) {
+            if (id.href.localeCompare(el.href) == 0) {
+                el.classList.add("active");
+            }
+        });
+    };
+
+    // Populate sidebar on load
+    window.addEventListener('load', function() {
+        var pagetoc = document.getElementsByClassName("pagetoc")[0];
+        var elements = document.getElementsByClassName("header");
+        Array.prototype.forEach.call(elements, function(el) {
+            var link = document.createElement("a");
+
+            // Indent shows hierarchy
+            var indent = "";
+            switch (el.parentElement.tagName) {
+                case "H1":
+                    return;
+                // case "H2":
+                //     indent = "20px";
+                //     break;
+                case "H3":
+                    indent = "20px";
+                    break;
+                case "H4":
+                    indent = "40px";
+                    break;
+                default:
+                    break;
+            }
+
+            link.appendChild(document.createTextNode(el.text));
+            link.style.paddingLeft = indent;
+            link.href = el.href;
+            pagetoc.appendChild(link);
+        });
+        updateFunction.call();
+    });
+
+    // Handle active elements on scroll
+    window.addEventListener("scroll", updateFunction);
+
+    var p = path.replace("index.html", "");
+    p = p.replace(".html", "");
+    var strs = p.split("/");
+    if (strs[strs.length-1] == ""){
+        strs.pop()
+    } 
+    var str = strs[strs.length-1];
+    var title = document.querySelector("main>h1,h2>a").textContent
+    var gitalk = new Gitalk({
+        clientID: '8e4b2cf9529ebb3dcad6',
+        clientSecret: '6f6e8c23575a780bdb1faba3c17be08d76dc35f8',
+        repo: 'rust-by-practice-comments',
+        owner: 'sunface',
+        admin: ["sunface"], 
+        labels: ['comments'],
+        title: title,
+        createIssueManually: false,
+        id: str,
+        distractionFreeMode: true
+    });
+    gitalk.render('gitalk-container');
+})();
\ No newline at end of file
diff --git a/assets/logo.png b/en/assets/logo.png
similarity index 100%
rename from assets/logo.png
rename to en/assets/logo.png
diff --git a/assets/temp.md b/en/assets/temp.md
similarity index 100%
rename from assets/temp.md
rename to en/assets/temp.md
diff --git a/book.toml b/en/book.toml
similarity index 83%
rename from book.toml
rename to en/book.toml
index e3c28f5..ca1e7c6 100644
--- a/book.toml
+++ b/en/book.toml
@@ -13,6 +13,8 @@ enable = true
 level = 1
 
 [output.html]
+additional-css = ["theme/style2.css"]
+additional-js = ["assets/custom.js"]
 git-repository-url = "https://github.com/sunface/rust-by-practice"
 edit-url-template = "https://github.com/sunface/rust-by-practice/edit/master/{path}"
 
diff --git a/deploy.sh b/en/deploy.sh
similarity index 95%
rename from deploy.sh
rename to en/deploy.sh
index a5207e7..354505a 100755
--- a/deploy.sh
+++ b/en/deploy.sh
@@ -21,5 +21,5 @@ git remote add origin https://github.com/sunface/rust-by-practice
 git push -u -f origin gh-pages
 
 ## deploy zh-CN
-cd ../zh-CN 
+cd ../../zh-book 
 ./deploy
\ No newline at end of file
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rename to en/src/why-exercise.md
diff --git a/en/theme/index.hbs b/en/theme/index.hbs
new file mode 100644
index 0000000..69134ba
--- /dev/null
+++ b/en/theme/index.hbs
@@ -0,0 +1,318 @@
+<!DOCTYPE HTML>
+<html lang="{{ language }}" class="sidebar-visible no-js {{ default_theme }}">
+    <head>
+        <!-- Book generated using mdBook -->
+        <meta charset="UTF-8">
+        <title>{{ title }}</title>
+        {{#if is_print }}
+        <meta name="robots" content="noindex" />
+        {{/if}}
+        {{#if base_url}}
+        <base href="{{ base_url }}">
+        {{/if}}
+
+
+        <!-- Custom HTML head -->
+        {{> head}}
+
+        <meta content="text/html; charset=utf-8" http-equiv="Content-Type">
+        <meta name="description" content="{{ description }}">
+        <meta name="viewport" content="width=device-width, initial-scale=1">
+        <meta name="theme-color" content="#ffffff" />
+
+        {{#if favicon_svg}}
+        <link rel="icon" href="{{ path_to_root }}favicon.svg">
+        {{/if}}
+        {{#if favicon_png}}
+        <link rel="shortcut icon" href="{{ path_to_root }}favicon.png">
+        {{/if}}
+        <link rel="stylesheet" href="{{ path_to_root }}css/variables.css">
+        <link rel="stylesheet" href="{{ path_to_root }}css/general.css">
+        <link rel="stylesheet" href="{{ path_to_root }}css/chrome.css">
+        {{#if print_enable}}
+        <link rel="stylesheet" href="{{ path_to_root }}css/print.css" media="print">
+        {{/if}}
+
+        <!-- Fonts -->
+        <link rel="stylesheet" href="{{ path_to_root }}FontAwesome/css/font-awesome.css">
+        {{#if copy_fonts}}
+        <link rel="stylesheet" href="{{ path_to_root }}fonts/fonts.css">
+        {{/if}}
+
+        <!-- Highlight.js Stylesheets -->
+        <link rel="stylesheet" href="{{ path_to_root }}highlight.css">
+        <link rel="stylesheet" href="{{ path_to_root }}tomorrow-night.css">
+        <link rel="stylesheet" href="{{ path_to_root }}ayu-highlight.css">
+
+        <!-- Custom theme stylesheets -->
+        {{#each additional_css}}
+        <link rel="stylesheet" href="{{ ../path_to_root }}{{ this }}">
+        {{/each}}
+
+        {{#if mathjax_support}}
+        <!-- MathJax -->
+        <script async type="text/javascript" src="https://cdnjs.cloudflare.com/ajax/libs/mathjax/2.7.1/MathJax.js?config=TeX-AMS-MML_HTMLorMML"></script>
+        {{/if}}
+
+        <link rel="stylesheet" href="https://unpkg.com/gitalk/dist/gitalk.css">
+        <script src="https://unpkg.com/gitalk/dist/gitalk.min.js"></script>
+    </head>
+    <body>
+        <!-- Provide site root to javascript -->
+        <script type="text/javascript">
+            var path_to_root = "{{ path_to_root }}";
+            var default_theme = window.matchMedia("(prefers-color-scheme: dark)").matches ? "{{ preferred_dark_theme }}" : "{{ default_theme }}";
+        </script>
+
+        <!-- Work around some values being stored in localStorage wrapped in quotes -->
+        <script type="text/javascript">
+            try {
+                var theme = localStorage.getItem('mdbook-theme');
+                var sidebar = localStorage.getItem('mdbook-sidebar');
+
+                if (theme.startsWith('"') && theme.endsWith('"')) {
+                    localStorage.setItem('mdbook-theme', theme.slice(1, theme.length - 1));
+                }
+
+                if (sidebar.startsWith('"') && sidebar.endsWith('"')) {
+                    localStorage.setItem('mdbook-sidebar', sidebar.slice(1, sidebar.length - 1));
+                }
+            } catch (e) { }
+        </script>
+
+        <!-- Set the theme before any content is loaded, prevents flash -->
+        <script type="text/javascript">
+            var theme;
+            try { theme = localStorage.getItem('mdbook-theme'); } catch(e) { }
+            if (theme === null || theme === undefined) { theme = default_theme; }
+            var html = document.querySelector('html');
+            html.classList.remove('no-js')
+            html.classList.remove('{{ default_theme }}')
+            html.classList.add(theme);
+            html.classList.add('js');
+        </script>
+
+        <!-- Hide / unhide sidebar before it is displayed -->
+        <script type="text/javascript">
+            var html = document.querySelector('html');
+            var sidebar = 'hidden';
+            if (document.body.clientWidth >= 1080) {
+                try { sidebar = localStorage.getItem('mdbook-sidebar'); } catch(e) { }
+                sidebar = sidebar || 'visible';
+            }
+            html.classList.remove('sidebar-visible');
+            html.classList.add("sidebar-" + sidebar);
+        </script>
+
+        <nav id="sidebar" class="sidebar" aria-label="Table of contents">
+            <div class="sidebar-scrollbox">
+                {{#toc}}{{/toc}}
+            </div>
+            <div id="sidebar-resize-handle" class="sidebar-resize-handle"></div>
+        </nav>
+
+        <div id="page-wrapper" class="page-wrapper">
+
+            <div class="page">
+                {{> header}}
+                <div id="menu-bar-hover-placeholder"></div>
+                <div id="menu-bar" class="menu-bar sticky bordered">
+                    <div class="left-buttons">
+                        <button id="sidebar-toggle" class="icon-button" type="button" title="Toggle Table of Contents" aria-label="Toggle Table of Contents" aria-controls="sidebar">
+                            <i class="fa fa-bars"></i>
+                        </button>
+                        <button id="theme-toggle" class="icon-button" type="button" title="Change theme" aria-label="Change theme" aria-haspopup="true" aria-expanded="false" aria-controls="theme-list">
+                            <i class="fa fa-paint-brush"></i>
+                        </button>
+                        <ul id="theme-list" class="theme-popup" aria-label="Themes" role="menu">
+                            <li role="none"><button role="menuitem" class="theme" id="light">{{ theme_option "Light" }}</button></li>
+                            <li role="none"><button role="menuitem" class="theme" id="rust">{{ theme_option "Rust" }}</button></li>
+                            <li role="none"><button role="menuitem" class="theme" id="coal">{{ theme_option "Coal" }}</button></li>
+                            <li role="none"><button role="menuitem" class="theme" id="navy">{{ theme_option "Navy" }}</button></li>
+                            <li role="none"><button role="menuitem" class="theme" id="ayu">{{ theme_option "Ayu" }}</button></li>
+                        </ul>
+                        {{#if search_enabled}}
+                        <button id="search-toggle" class="icon-button" type="button" title="Search. (Shortkey: s)" aria-label="Toggle Searchbar" aria-expanded="false" aria-keyshortcuts="S" aria-controls="searchbar">
+                            <i class="fa fa-search"></i>
+                        </button>
+                        {{/if}}
+                    </div>
+
+                    <h1 class="menu-title">{{ book_title }}</h1>
+
+                    <div class="right-buttons">
+                        {{#if print_enable}}
+                        <a href="{{ path_to_root }}print.html" title="Print this book" aria-label="Print this book">
+                            <i id="print-button" class="fa fa-print"></i>
+                        </a>
+                        {{/if}}
+                        {{#if git_repository_url}}
+                        <a href="{{git_repository_url}}" title="Git repository" aria-label="Git repository">
+                            <i id="git-repository-button" class="fa {{git_repository_icon}}"></i>
+                        </a>
+                        {{/if}}
+                        {{#if git_repository_edit_url}}
+                        <a href="{{git_repository_edit_url}}" title="Suggest an edit" aria-label="Suggest an edit">
+                            <i id="git-edit-button" class="fa fa-edit"></i>
+                        </a>
+                        {{/if}}
+
+                    </div>
+                </div>
+
+                {{#if search_enabled}}
+                <div id="search-wrapper" class="hidden">
+                    <form id="searchbar-outer" class="searchbar-outer">
+                        <input type="search" id="searchbar" name="searchbar" placeholder="Search this book ..." aria-controls="searchresults-outer" aria-describedby="searchresults-header">
+                    </form>
+                    <div id="searchresults-outer" class="searchresults-outer hidden">
+                        <div id="searchresults-header" class="searchresults-header"></div>
+                        <ul id="searchresults">
+                        </ul>
+                    </div>
+                </div>
+                {{/if}}
+
+                <!-- Apply ARIA attributes after the sidebar and the sidebar toggle button are added to the DOM -->
+                <script type="text/javascript">
+                    document.getElementById('sidebar-toggle').setAttribute('aria-expanded', sidebar === 'visible');
+                    document.getElementById('sidebar').setAttribute('aria-hidden', sidebar !== 'visible');
+                    Array.from(document.querySelectorAll('#sidebar a')).forEach(function(link) {
+                        link.setAttribute('tabIndex', sidebar === 'visible' ? 0 : -1);
+                    });
+                </script>
+
+                <div id="content" class="content">
+                    <!-- Page table of contents -->
+                    <div class="sidetoc"><nav class="pagetoc"></nav></div>
+                    <main>
+                        {{{ content }}}
+                        <div id="gitalk-container"></div>
+                    </main>
+
+                    <nav class="nav-wrapper" aria-label="Page navigation">
+                        <!-- Mobile navigation buttons -->
+                        {{#previous}}
+                            <a rel="prev" href="{{ path_to_root }}{{link}}" class="mobile-nav-chapters previous" title="Previous chapter" aria-label="Previous chapter" aria-keyshortcuts="Left">
+                                <i class="fa fa-angle-left"></i>
+                            </a>
+                        {{/previous}}
+
+                        {{#next}}
+                            <a rel="next" href="{{ path_to_root }}{{link}}" class="mobile-nav-chapters next" title="Next chapter" aria-label="Next chapter" aria-keyshortcuts="Right">
+                                <i class="fa fa-angle-right"></i>
+                            </a>
+                        {{/next}}
+
+                        <div style="clear: both"></div>
+                    </nav>
+                </div>
+            </div>
+
+            <nav class="nav-wide-wrapper" aria-label="Page navigation">
+                {{#previous}}
+                    <a rel="prev" href="{{ path_to_root }}{{link}}" class="nav-chapters previous" title="Previous chapter" aria-label="Previous chapter" aria-keyshortcuts="Left">
+                        <i class="fa fa-angle-left"></i>
+                    </a>
+                {{/previous}}
+
+                {{#next}}
+                    <a rel="next" href="{{ path_to_root }}{{link}}" class="nav-chapters next" title="Next chapter" aria-label="Next chapter" aria-keyshortcuts="Right">
+                        <i class="fa fa-angle-right"></i>
+                    </a>
+                {{/next}}
+            </nav>
+
+        </div>
+
+        {{#if livereload}}
+        <!-- Livereload script (if served using the cli tool) -->
+        <script type="text/javascript">
+            var socket = new WebSocket("{{{livereload}}}");
+            socket.onmessage = function (event) {
+                if (event.data === "reload") {
+                    socket.close();
+                    location.reload();
+                }
+            };
+
+            window.onbeforeunload = function() {
+                socket.close();
+            }
+        </script>
+        {{/if}}
+
+        {{#if google_analytics}}
+        <!-- Google Analytics Tag -->
+        <script type="text/javascript">
+            var localAddrs = ["localhost", "127.0.0.1", ""];
+
+            // make sure we don't activate google analytics if the developer is
+            // inspecting the book locally...
+            if (localAddrs.indexOf(document.location.hostname) === -1) {
+                (function(i,s,o,g,r,a,m){i['GoogleAnalyticsObject']=r;i[r]=i[r]||function(){
+                (i[r].q=i[r].q||[]).push(arguments)},i[r].l=1*new Date();a=s.createElement(o),
+                m=s.getElementsByTagName(o)[0];a.async=1;a.src=g;m.parentNode.insertBefore(a,m)
+                })(window,document,'script','https://www.google-analytics.com/analytics.js','ga');
+
+                ga('create', '{{google_analytics}}', 'auto');
+                ga('send', 'pageview');
+            }
+        </script>
+        {{/if}}
+
+        {{#if playground_line_numbers}}
+        <script type="text/javascript">
+            window.playground_line_numbers = true;
+        </script>
+        {{/if}}
+
+        {{#if playground_copyable}}
+        <script type="text/javascript">
+            window.playground_copyable = true;
+        </script>
+        {{/if}}
+
+        {{#if playground_js}}
+        <script src="{{ path_to_root }}ace.js" type="text/javascript" charset="utf-8"></script>
+        <script src="{{ path_to_root }}editor.js" type="text/javascript" charset="utf-8"></script>
+        <script src="{{ path_to_root }}mode-rust.js" type="text/javascript" charset="utf-8"></script>
+        <script src="{{ path_to_root }}theme-dawn.js" type="text/javascript" charset="utf-8"></script>
+        <script src="{{ path_to_root }}theme-tomorrow_night.js" type="text/javascript" charset="utf-8"></script>
+        {{/if}}
+
+        {{#if search_js}}
+        <script src="{{ path_to_root }}elasticlunr.min.js" type="text/javascript" charset="utf-8"></script>
+        <script src="{{ path_to_root }}mark.min.js" type="text/javascript" charset="utf-8"></script>
+        <script src="{{ path_to_root }}searcher.js" type="text/javascript" charset="utf-8"></script>
+        {{/if}}
+
+        <script src="{{ path_to_root }}clipboard.min.js" type="text/javascript" charset="utf-8"></script>
+        <script src="{{ path_to_root }}highlight.js" type="text/javascript" charset="utf-8"></script>
+        <script src="{{ path_to_root }}book.js" type="text/javascript" charset="utf-8"></script>
+
+        <!-- Custom JS scripts -->
+        {{#each additional_js}}
+        <script type="text/javascript" src="{{ ../path_to_root }}{{this}}"></script>
+        {{/each}}
+
+        {{#if is_print}}
+        {{#if mathjax_support}}
+        <script type="text/javascript">
+        window.addEventListener('load', function() {
+            MathJax.Hub.Register.StartupHook('End', function() {
+                window.setTimeout(window.print, 100);
+            });
+        });
+        </script>
+        {{else}}
+        <script type="text/javascript">
+        window.addEventListener('load', function() {
+            window.setTimeout(window.print, 100);
+        });
+        </script>
+        {{/if}}
+        {{/if}}
+
+    </body>
+</html>
\ No newline at end of file
diff --git a/en/theme/style2.css b/en/theme/style2.css
new file mode 100644
index 0000000..16b7e03
--- /dev/null
+++ b/en/theme/style2.css
@@ -0,0 +1,53 @@
+@media only screen and (max-width:1080px) {
+    .sidetoc {
+        display: none !important;
+    }
+}
+
+@media only screen and (min-width:1080px) {
+    main {
+        position: relative;
+        padding-right: 170px;
+    }
+    .sidetoc {
+        margin-left: auto;
+        margin-right: auto;
+        /*left: calc(100% + (var(--content-max-width))/4 - 180px);*/
+        left: calc(100% - 200px);
+        position: absolute;
+    }
+    .pagetoc {
+        position: fixed;
+        width: 200px;
+        height: calc(100vh - var(--menu-bar-height) - 0.67em * 4);
+        overflow: auto;
+    }
+    .pagetoc a {
+        border-left: 1px solid var(--sidebar-bg);
+        color: var(--fg) !important;
+        display: block;
+        padding-bottom: 5px;
+        padding-top: 5px;
+        padding-left: 10px;
+        text-align: left;
+        text-decoration: none;
+        font-size: 1.2rem;
+    }
+    .pagetoc a:hover,
+    .pagetoc a.active {
+        background: var(--sidebar-bg);
+        color: var(--sidebar-fg) !important;
+    }
+    .pagetoc .active {
+        background: var(--sidebar-bg);
+        color: var(--sidebar-fg);
+    }
+}
+
+.page-footer {
+    margin-top: 50px;
+    border-top: 1px solid #ccc;
+    overflow: hidden;
+    padding: 10px 0;
+    color: gray;
+}
\ No newline at end of file
diff --git a/zh-CN/.DS_Store b/zh-CN/.DS_Store
index d3603fd..bf66362 100644
Binary files a/zh-CN/.DS_Store and b/zh-CN/.DS_Store differ
diff --git a/zh-CN/.gitignore b/zh-CN/.gitignore
deleted file mode 100644
index 7585238..0000000
--- a/zh-CN/.gitignore
+++ /dev/null
@@ -1 +0,0 @@
-book
diff --git a/zh-CN/assets/custom.js b/zh-CN/assets/custom.js
new file mode 100644
index 0000000..6fd7c44
--- /dev/null
+++ b/zh-CN/assets/custom.js
@@ -0,0 +1,104 @@
+(function() {
+    var path = window.location.pathname;
+    if (path.endsWith("/print.html")) {
+        return;
+    }
+
+    var images = document.querySelectorAll("main img")
+    Array.prototype.forEach.call(images, function(img) {
+        img.addEventListener("click", function() {
+            BigPicture({
+                el: img,
+            });
+        });
+    });
+
+    // Un-active everything when you click it
+    Array.prototype.forEach.call(document.getElementsByClassName("pagetoc")[0].children, function(el) {
+        el.addEventHandler("click", function() {
+            Array.prototype.forEach.call(document.getElementsByClassName("pagetoc")[0].children, function(el) {
+                el.classList.remove("active");
+            });
+            el.classList.add("active");
+        });
+    });
+
+    var updateFunction = function() {
+
+        var id;
+        var elements = document.getElementsByClassName("header");
+        Array.prototype.forEach.call(elements, function(el) {
+            if (window.pageYOffset >= el.offsetTop) {
+                id = el;
+            }
+        });
+
+        Array.prototype.forEach.call(document.getElementsByClassName("pagetoc")[0].children, function(el) {
+            el.classList.remove("active");
+        });
+
+        Array.prototype.forEach.call(document.getElementsByClassName("pagetoc")[0].children, function(el) {
+            if (id.href.localeCompare(el.href) == 0) {
+                el.classList.add("active");
+            }
+        });
+    };
+
+    // Populate sidebar on load
+    window.addEventListener('load', function() {
+        var pagetoc = document.getElementsByClassName("pagetoc")[0];
+        var elements = document.getElementsByClassName("header");
+        Array.prototype.forEach.call(elements, function(el) {
+            var link = document.createElement("a");
+
+            // Indent shows hierarchy
+            var indent = "";
+            switch (el.parentElement.tagName) {
+                case "H1":
+                    return;
+                // case "H2":
+                //     indent = "20px";
+                //     break;
+                case "H3":
+                    indent = "20px";
+                    break;
+                case "H4":
+                    indent = "40px";
+                    break;
+                default:
+                    break;
+            }
+
+            link.appendChild(document.createTextNode(el.text));
+            link.style.paddingLeft = indent;
+            link.href = el.href;
+            pagetoc.appendChild(link);
+        });
+        updateFunction.call();
+    });
+
+    // Handle active elements on scroll
+    window.addEventListener("scroll", updateFunction);
+
+    var p = path.replace("index.html", "");
+    p = p.replace(".html", "");
+    var strs = p.split("/");
+    if (strs[strs.length-1] == ""){
+        strs.pop()
+    } 
+    var str = strs[strs.length-1];
+    var title = document.querySelector("main>h1,h2>a").textContent
+    var gitalk = new Gitalk({
+        clientID: '8e4b2cf9529ebb3dcad6',
+        clientSecret: '6f6e8c23575a780bdb1faba3c17be08d76dc35f8',
+        repo: 'rust-by-practice-comments',
+        owner: 'sunface',
+        admin: ["sunface"], 
+        labels: ['comments'],
+        title: title,
+        createIssueManually: false,
+        id: str,
+        distractionFreeMode: true
+    });
+    gitalk.render('gitalk-container');
+})();
\ No newline at end of file
diff --git a/zh-CN/book.toml b/zh-CN/book.toml
index f6c4e69..5b5b44c 100644
--- a/zh-CN/book.toml
+++ b/zh-CN/book.toml
@@ -1,6 +1,6 @@
 [book]
 title = "Rust By Practice( Rust 练习实践 )"
-description = "Practice Rust by example, exercise and hand-to-hand projects. Written with ❤️ by https://course.rs team"
+description = "Learning Rust By Practice, narrowing the gap between beginner and skilled-dev with challenging examples, exercises and projects."
 authors = ["sunface, https://im.dev"]
 language = "en"
 
@@ -13,6 +13,8 @@ enable = true
 level = 1
 
 [output.html]
+additional-css = ["theme/style2.css"]
+additional-js = ["assets/custom.js"]
 git-repository-url = "https://github.com/sunface/rust-by-practice"
 edit-url-template = "https://github.com/sunface/rust-by-practice/edit/master/zh-CN/{path}"
 
diff --git a/zh-CN/theme/index.hbs b/zh-CN/theme/index.hbs
new file mode 100644
index 0000000..69134ba
--- /dev/null
+++ b/zh-CN/theme/index.hbs
@@ -0,0 +1,318 @@
+<!DOCTYPE HTML>
+<html lang="{{ language }}" class="sidebar-visible no-js {{ default_theme }}">
+    <head>
+        <!-- Book generated using mdBook -->
+        <meta charset="UTF-8">
+        <title>{{ title }}</title>
+        {{#if is_print }}
+        <meta name="robots" content="noindex" />
+        {{/if}}
+        {{#if base_url}}
+        <base href="{{ base_url }}">
+        {{/if}}
+
+
+        <!-- Custom HTML head -->
+        {{> head}}
+
+        <meta content="text/html; charset=utf-8" http-equiv="Content-Type">
+        <meta name="description" content="{{ description }}">
+        <meta name="viewport" content="width=device-width, initial-scale=1">
+        <meta name="theme-color" content="#ffffff" />
+
+        {{#if favicon_svg}}
+        <link rel="icon" href="{{ path_to_root }}favicon.svg">
+        {{/if}}
+        {{#if favicon_png}}
+        <link rel="shortcut icon" href="{{ path_to_root }}favicon.png">
+        {{/if}}
+        <link rel="stylesheet" href="{{ path_to_root }}css/variables.css">
+        <link rel="stylesheet" href="{{ path_to_root }}css/general.css">
+        <link rel="stylesheet" href="{{ path_to_root }}css/chrome.css">
+        {{#if print_enable}}
+        <link rel="stylesheet" href="{{ path_to_root }}css/print.css" media="print">
+        {{/if}}
+
+        <!-- Fonts -->
+        <link rel="stylesheet" href="{{ path_to_root }}FontAwesome/css/font-awesome.css">
+        {{#if copy_fonts}}
+        <link rel="stylesheet" href="{{ path_to_root }}fonts/fonts.css">
+        {{/if}}
+
+        <!-- Highlight.js Stylesheets -->
+        <link rel="stylesheet" href="{{ path_to_root }}highlight.css">
+        <link rel="stylesheet" href="{{ path_to_root }}tomorrow-night.css">
+        <link rel="stylesheet" href="{{ path_to_root }}ayu-highlight.css">
+
+        <!-- Custom theme stylesheets -->
+        {{#each additional_css}}
+        <link rel="stylesheet" href="{{ ../path_to_root }}{{ this }}">
+        {{/each}}
+
+        {{#if mathjax_support}}
+        <!-- MathJax -->
+        <script async type="text/javascript" src="https://cdnjs.cloudflare.com/ajax/libs/mathjax/2.7.1/MathJax.js?config=TeX-AMS-MML_HTMLorMML"></script>
+        {{/if}}
+
+        <link rel="stylesheet" href="https://unpkg.com/gitalk/dist/gitalk.css">
+        <script src="https://unpkg.com/gitalk/dist/gitalk.min.js"></script>
+    </head>
+    <body>
+        <!-- Provide site root to javascript -->
+        <script type="text/javascript">
+            var path_to_root = "{{ path_to_root }}";
+            var default_theme = window.matchMedia("(prefers-color-scheme: dark)").matches ? "{{ preferred_dark_theme }}" : "{{ default_theme }}";
+        </script>
+
+        <!-- Work around some values being stored in localStorage wrapped in quotes -->
+        <script type="text/javascript">
+            try {
+                var theme = localStorage.getItem('mdbook-theme');
+                var sidebar = localStorage.getItem('mdbook-sidebar');
+
+                if (theme.startsWith('"') && theme.endsWith('"')) {
+                    localStorage.setItem('mdbook-theme', theme.slice(1, theme.length - 1));
+                }
+
+                if (sidebar.startsWith('"') && sidebar.endsWith('"')) {
+                    localStorage.setItem('mdbook-sidebar', sidebar.slice(1, sidebar.length - 1));
+                }
+            } catch (e) { }
+        </script>
+
+        <!-- Set the theme before any content is loaded, prevents flash -->
+        <script type="text/javascript">
+            var theme;
+            try { theme = localStorage.getItem('mdbook-theme'); } catch(e) { }
+            if (theme === null || theme === undefined) { theme = default_theme; }
+            var html = document.querySelector('html');
+            html.classList.remove('no-js')
+            html.classList.remove('{{ default_theme }}')
+            html.classList.add(theme);
+            html.classList.add('js');
+        </script>
+
+        <!-- Hide / unhide sidebar before it is displayed -->
+        <script type="text/javascript">
+            var html = document.querySelector('html');
+            var sidebar = 'hidden';
+            if (document.body.clientWidth >= 1080) {
+                try { sidebar = localStorage.getItem('mdbook-sidebar'); } catch(e) { }
+                sidebar = sidebar || 'visible';
+            }
+            html.classList.remove('sidebar-visible');
+            html.classList.add("sidebar-" + sidebar);
+        </script>
+
+        <nav id="sidebar" class="sidebar" aria-label="Table of contents">
+            <div class="sidebar-scrollbox">
+                {{#toc}}{{/toc}}
+            </div>
+            <div id="sidebar-resize-handle" class="sidebar-resize-handle"></div>
+        </nav>
+
+        <div id="page-wrapper" class="page-wrapper">
+
+            <div class="page">
+                {{> header}}
+                <div id="menu-bar-hover-placeholder"></div>
+                <div id="menu-bar" class="menu-bar sticky bordered">
+                    <div class="left-buttons">
+                        <button id="sidebar-toggle" class="icon-button" type="button" title="Toggle Table of Contents" aria-label="Toggle Table of Contents" aria-controls="sidebar">
+                            <i class="fa fa-bars"></i>
+                        </button>
+                        <button id="theme-toggle" class="icon-button" type="button" title="Change theme" aria-label="Change theme" aria-haspopup="true" aria-expanded="false" aria-controls="theme-list">
+                            <i class="fa fa-paint-brush"></i>
+                        </button>
+                        <ul id="theme-list" class="theme-popup" aria-label="Themes" role="menu">
+                            <li role="none"><button role="menuitem" class="theme" id="light">{{ theme_option "Light" }}</button></li>
+                            <li role="none"><button role="menuitem" class="theme" id="rust">{{ theme_option "Rust" }}</button></li>
+                            <li role="none"><button role="menuitem" class="theme" id="coal">{{ theme_option "Coal" }}</button></li>
+                            <li role="none"><button role="menuitem" class="theme" id="navy">{{ theme_option "Navy" }}</button></li>
+                            <li role="none"><button role="menuitem" class="theme" id="ayu">{{ theme_option "Ayu" }}</button></li>
+                        </ul>
+                        {{#if search_enabled}}
+                        <button id="search-toggle" class="icon-button" type="button" title="Search. (Shortkey: s)" aria-label="Toggle Searchbar" aria-expanded="false" aria-keyshortcuts="S" aria-controls="searchbar">
+                            <i class="fa fa-search"></i>
+                        </button>
+                        {{/if}}
+                    </div>
+
+                    <h1 class="menu-title">{{ book_title }}</h1>
+
+                    <div class="right-buttons">
+                        {{#if print_enable}}
+                        <a href="{{ path_to_root }}print.html" title="Print this book" aria-label="Print this book">
+                            <i id="print-button" class="fa fa-print"></i>
+                        </a>
+                        {{/if}}
+                        {{#if git_repository_url}}
+                        <a href="{{git_repository_url}}" title="Git repository" aria-label="Git repository">
+                            <i id="git-repository-button" class="fa {{git_repository_icon}}"></i>
+                        </a>
+                        {{/if}}
+                        {{#if git_repository_edit_url}}
+                        <a href="{{git_repository_edit_url}}" title="Suggest an edit" aria-label="Suggest an edit">
+                            <i id="git-edit-button" class="fa fa-edit"></i>
+                        </a>
+                        {{/if}}
+
+                    </div>
+                </div>
+
+                {{#if search_enabled}}
+                <div id="search-wrapper" class="hidden">
+                    <form id="searchbar-outer" class="searchbar-outer">
+                        <input type="search" id="searchbar" name="searchbar" placeholder="Search this book ..." aria-controls="searchresults-outer" aria-describedby="searchresults-header">
+                    </form>
+                    <div id="searchresults-outer" class="searchresults-outer hidden">
+                        <div id="searchresults-header" class="searchresults-header"></div>
+                        <ul id="searchresults">
+                        </ul>
+                    </div>
+                </div>
+                {{/if}}
+
+                <!-- Apply ARIA attributes after the sidebar and the sidebar toggle button are added to the DOM -->
+                <script type="text/javascript">
+                    document.getElementById('sidebar-toggle').setAttribute('aria-expanded', sidebar === 'visible');
+                    document.getElementById('sidebar').setAttribute('aria-hidden', sidebar !== 'visible');
+                    Array.from(document.querySelectorAll('#sidebar a')).forEach(function(link) {
+                        link.setAttribute('tabIndex', sidebar === 'visible' ? 0 : -1);
+                    });
+                </script>
+
+                <div id="content" class="content">
+                    <!-- Page table of contents -->
+                    <div class="sidetoc"><nav class="pagetoc"></nav></div>
+                    <main>
+                        {{{ content }}}
+                        <div id="gitalk-container"></div>
+                    </main>
+
+                    <nav class="nav-wrapper" aria-label="Page navigation">
+                        <!-- Mobile navigation buttons -->
+                        {{#previous}}
+                            <a rel="prev" href="{{ path_to_root }}{{link}}" class="mobile-nav-chapters previous" title="Previous chapter" aria-label="Previous chapter" aria-keyshortcuts="Left">
+                                <i class="fa fa-angle-left"></i>
+                            </a>
+                        {{/previous}}
+
+                        {{#next}}
+                            <a rel="next" href="{{ path_to_root }}{{link}}" class="mobile-nav-chapters next" title="Next chapter" aria-label="Next chapter" aria-keyshortcuts="Right">
+                                <i class="fa fa-angle-right"></i>
+                            </a>
+                        {{/next}}
+
+                        <div style="clear: both"></div>
+                    </nav>
+                </div>
+            </div>
+
+            <nav class="nav-wide-wrapper" aria-label="Page navigation">
+                {{#previous}}
+                    <a rel="prev" href="{{ path_to_root }}{{link}}" class="nav-chapters previous" title="Previous chapter" aria-label="Previous chapter" aria-keyshortcuts="Left">
+                        <i class="fa fa-angle-left"></i>
+                    </a>
+                {{/previous}}
+
+                {{#next}}
+                    <a rel="next" href="{{ path_to_root }}{{link}}" class="nav-chapters next" title="Next chapter" aria-label="Next chapter" aria-keyshortcuts="Right">
+                        <i class="fa fa-angle-right"></i>
+                    </a>
+                {{/next}}
+            </nav>
+
+        </div>
+
+        {{#if livereload}}
+        <!-- Livereload script (if served using the cli tool) -->
+        <script type="text/javascript">
+            var socket = new WebSocket("{{{livereload}}}");
+            socket.onmessage = function (event) {
+                if (event.data === "reload") {
+                    socket.close();
+                    location.reload();
+                }
+            };
+
+            window.onbeforeunload = function() {
+                socket.close();
+            }
+        </script>
+        {{/if}}
+
+        {{#if google_analytics}}
+        <!-- Google Analytics Tag -->
+        <script type="text/javascript">
+            var localAddrs = ["localhost", "127.0.0.1", ""];
+
+            // make sure we don't activate google analytics if the developer is
+            // inspecting the book locally...
+            if (localAddrs.indexOf(document.location.hostname) === -1) {
+                (function(i,s,o,g,r,a,m){i['GoogleAnalyticsObject']=r;i[r]=i[r]||function(){
+                (i[r].q=i[r].q||[]).push(arguments)},i[r].l=1*new Date();a=s.createElement(o),
+                m=s.getElementsByTagName(o)[0];a.async=1;a.src=g;m.parentNode.insertBefore(a,m)
+                })(window,document,'script','https://www.google-analytics.com/analytics.js','ga');
+
+                ga('create', '{{google_analytics}}', 'auto');
+                ga('send', 'pageview');
+            }
+        </script>
+        {{/if}}
+
+        {{#if playground_line_numbers}}
+        <script type="text/javascript">
+            window.playground_line_numbers = true;
+        </script>
+        {{/if}}
+
+        {{#if playground_copyable}}
+        <script type="text/javascript">
+            window.playground_copyable = true;
+        </script>
+        {{/if}}
+
+        {{#if playground_js}}
+        <script src="{{ path_to_root }}ace.js" type="text/javascript" charset="utf-8"></script>
+        <script src="{{ path_to_root }}editor.js" type="text/javascript" charset="utf-8"></script>
+        <script src="{{ path_to_root }}mode-rust.js" type="text/javascript" charset="utf-8"></script>
+        <script src="{{ path_to_root }}theme-dawn.js" type="text/javascript" charset="utf-8"></script>
+        <script src="{{ path_to_root }}theme-tomorrow_night.js" type="text/javascript" charset="utf-8"></script>
+        {{/if}}
+
+        {{#if search_js}}
+        <script src="{{ path_to_root }}elasticlunr.min.js" type="text/javascript" charset="utf-8"></script>
+        <script src="{{ path_to_root }}mark.min.js" type="text/javascript" charset="utf-8"></script>
+        <script src="{{ path_to_root }}searcher.js" type="text/javascript" charset="utf-8"></script>
+        {{/if}}
+
+        <script src="{{ path_to_root }}clipboard.min.js" type="text/javascript" charset="utf-8"></script>
+        <script src="{{ path_to_root }}highlight.js" type="text/javascript" charset="utf-8"></script>
+        <script src="{{ path_to_root }}book.js" type="text/javascript" charset="utf-8"></script>
+
+        <!-- Custom JS scripts -->
+        {{#each additional_js}}
+        <script type="text/javascript" src="{{ ../path_to_root }}{{this}}"></script>
+        {{/each}}
+
+        {{#if is_print}}
+        {{#if mathjax_support}}
+        <script type="text/javascript">
+        window.addEventListener('load', function() {
+            MathJax.Hub.Register.StartupHook('End', function() {
+                window.setTimeout(window.print, 100);
+            });
+        });
+        </script>
+        {{else}}
+        <script type="text/javascript">
+        window.addEventListener('load', function() {
+            window.setTimeout(window.print, 100);
+        });
+        </script>
+        {{/if}}
+        {{/if}}
+
+    </body>
+</html>
\ No newline at end of file
diff --git a/zh-CN/theme/style2.css b/zh-CN/theme/style2.css
new file mode 100644
index 0000000..16b7e03
--- /dev/null
+++ b/zh-CN/theme/style2.css
@@ -0,0 +1,53 @@
+@media only screen and (max-width:1080px) {
+    .sidetoc {
+        display: none !important;
+    }
+}
+
+@media only screen and (min-width:1080px) {
+    main {
+        position: relative;
+        padding-right: 170px;
+    }
+    .sidetoc {
+        margin-left: auto;
+        margin-right: auto;
+        /*left: calc(100% + (var(--content-max-width))/4 - 180px);*/
+        left: calc(100% - 200px);
+        position: absolute;
+    }
+    .pagetoc {
+        position: fixed;
+        width: 200px;
+        height: calc(100vh - var(--menu-bar-height) - 0.67em * 4);
+        overflow: auto;
+    }
+    .pagetoc a {
+        border-left: 1px solid var(--sidebar-bg);
+        color: var(--fg) !important;
+        display: block;
+        padding-bottom: 5px;
+        padding-top: 5px;
+        padding-left: 10px;
+        text-align: left;
+        text-decoration: none;
+        font-size: 1.2rem;
+    }
+    .pagetoc a:hover,
+    .pagetoc a.active {
+        background: var(--sidebar-bg);
+        color: var(--sidebar-fg) !important;
+    }
+    .pagetoc .active {
+        background: var(--sidebar-bg);
+        color: var(--sidebar-fg);
+    }
+}
+
+.page-footer {
+    margin-top: 50px;
+    border-top: 1px solid #ccc;
+    overflow: hidden;
+    padding: 10px 0;
+    color: gray;
+}
\ No newline at end of file