diff --git a/public/_includes/_hero-home.jade b/public/_includes/_hero-home.jade
index c6efb3e28b..a653da5d4f 100644
--- a/public/_includes/_hero-home.jade
+++ b/public/_includes/_hero-home.jade
@@ -5,6 +5,8 @@ header(class="background-sky")
     .hero-cta
       a(href="/docs/ts/latest/quickstart.html" class="md-raised button button-large button-plain" md-button) 开始吧！
 
+    h2 点击“译文”可显示/隐藏“原文”，点击“原文”可隐藏自身
+
 .banner.banner-floaty
   .banner-ng-annoucement
     div(class="banner-text")
diff --git a/public/_includes/_main-nav.jade b/public/_includes/_main-nav.jade
index 1b13d2b3ce..78496379fa 100644
--- a/public/_includes/_main-nav.jade
+++ b/public/_includes/_main-nav.jade
@@ -14,3 +14,7 @@ md-toolbar(class="main-nav background-regal l-pinned-top l-layer-5",scroll-y-off
       li.l-left <a class="main-nav-button" href="/news.html" md-button>新闻</a>
       li.l-left <a class="main-nav-button" href="/translate/cn/about.html" md-button>关于中文版</a>
       li.l-right <a class="main-nav-button" href="/docs/ts/latest/quickstart.html" md-button>立即开始！</a>
+      li.l-right
+        a.main-nav-button.md-button(ng-click="appCtrl.toggleSource($event)", href)
+          span(ng-if="!appCtrl.sourceVisible") 显示原文
+          span(ng-if="appCtrl.sourceVisible") 隐藏原文
diff --git a/public/_includes/_scripts-include.jade b/public/_includes/_scripts-include.jade
index bbf241cd3e..5dd3407ed7 100644
--- a/public/_includes/_scripts-include.jade
+++ b/public/_includes/_scripts-include.jade
@@ -15,8 +15,8 @@ script(src="/resources/js/vendor/angular-material.min.js")
 
 
 <!-- Angular.io Site JS -->
-script(src="/resources/js/site.js")
 script(src="/resources/js/translate.js")
+script(src="/resources/js/site.js")
 script(src="/resources/js/controllers/app-controller.js")
 script(src="/resources/js/directives/cheatsheet.js")
 script(src="/resources/js/directives/api-list.js")
diff --git a/public/docs/ts/latest/tutorial/index.jade b/public/docs/ts/latest/tutorial/index.jade
index e08eb54a9f..991ec9a81e 100644
--- a/public/docs/ts/latest/tutorial/index.jade
+++ b/public/docs/ts/latest/tutorial/index.jade
@@ -15,7 +15,7 @@ include ../_util-fns
   a list of heroes, editing a selected hero's detail, and navigating among different
   views of heroic data.
 
-  当然，在这个教程中，我们只完成一小步。我们这次构建的应用会涉及很多特性：获得并显示英雄列表，编辑所选英雄的详情，并在英雄数据的多个视图之间建立导航。这些特性，在成熟的、数据驱动的应用中经常见到。
+  当然，在本教程中，我们只完成一小步。我们这次构建的应用会涉及很多特性：获得并显示英雄列表，编辑所选英雄的详情，并在英雄数据的多个视图之间建立导航。这些特性，在成熟的、数据驱动的应用中经常见到。
 
   The Tour of Heroes covers the core fundamentals of Angular.
   We’ll use built-in directives to show/hide elements and display lists of hero data.
@@ -25,7 +25,7 @@ include ../_util-fns
   We’ll learn to select a hero from a master list and edit that hero in the details view. We'll
   format data with pipes. We'll create a shared service to assemble our heroes. And we'll use routing to navigate among different views and their components.
 
-  这个《英雄指南》覆盖了Angular的核心原理。
+  这篇《英雄指南》覆盖了Angular的核心原理。
   我们将使用内建指令来显示/隐藏元素，并且显示英雄数据的列表。
   我们将创建一个组件来显示英雄的详情，另一个组件则用来显示英雄列表。
   我们将对只读数据使用单向数据绑定。我们将添加一些可编辑字段，并通过双向数据绑定更新模型。
@@ -59,7 +59,7 @@ include ../_util-fns
   Here's a visual idea of where we're going in this tour, beginning with the "Dashboard"
   view and our most heroic heroes:
   
-  在这个教程中，还引入了一些可视化思想：放一个“仪表盘（Dashboard）”视图，来展示我们最勇敢的英雄。
+  在本教程中，还引入了一些可视化思想：放一个“仪表盘（Dashboard）”视图，来展示我们最勇敢的英雄。
 
 figure.image-display
   img(src='/resources/images/devguide/toh/heroes-dashboard-1.png' alt="英雄仪表盘的输出")
diff --git a/public/docs/ts/latest/tutorial/toh-pt1.jade b/public/docs/ts/latest/tutorial/toh-pt1.jade
index f713e6250b..567c6a6b2d 100644
--- a/public/docs/ts/latest/tutorial/toh-pt1.jade
+++ b/public/docs/ts/latest/tutorial/toh-pt1.jade
@@ -60,7 +60,7 @@ code-example(format="" language="bash").
     ## 显示我们的英雄
     We want to display Hero data in our app
     
-    我们要在我们的应用中显示英雄数据
+    我们要在应用中显示英雄数据
 
     Let's add two properties to our `AppComponent`, a `title` property for the application name and a `hero` property
     for a hero named "Windstorm".
diff --git a/public/resources/css/_translate.scss b/public/resources/css/_translate.scss
index fec7ab5ab4..2005a2d154 100644
--- a/public/resources/css/_translate.scss
+++ b/public/resources/css/_translate.scss
@@ -1,9 +1,8 @@
 .original-english {
-  display: none !important;
-}
-
-.original-english-debug {
-  border-bottom: 1px dashed red;
+  border-top: 1px dashed $regal;
+  &.hidden {
+    display: none !important;
+  }
 }
 
 .translated-cn {
diff --git a/public/resources/js/controllers/app-controller.js b/public/resources/js/controllers/app-controller.js
index c8f4e15bdc..246b695bcb 100644
--- a/public/resources/js/controllers/app-controller.js
+++ b/public/resources/js/controllers/app-controller.js
@@ -8,7 +8,7 @@ angularIO.controller('AppCtrl', ['$mdDialog', '$timeout', '$http', '$sce', funct
 
   vm.showDocsNav = false;
   vm.showMainNav = false;
-  vm.showMenu    = false;
+  vm.showMenu = false;
 
   // TOGGLE MAIN NAV (TOP) ON MOBILE
   vm.toggleDocsMenu = function () {
@@ -25,7 +25,7 @@ angularIO.controller('AppCtrl', ['$mdDialog', '$timeout', '$http', '$sce', funct
     vm.showMenu = !vm.showMenu;
   };
 
-  vm.openFeedback = function() {
+  vm.openFeedback = function () {
     var configuration = {
       'productId': '410509',
       'authuser': '1',
@@ -36,7 +36,7 @@ angularIO.controller('AppCtrl', ['$mdDialog', '$timeout', '$http', '$sce', funct
 
   // URL hash keeps track of which method the user wants to view in the API doc.
   // Refer to _api.scss (.anchor-focused) and class.template.html (where ng-class is used) for details.
-  vm.isApiDocMemberFocused = function(memberName) {
+  vm.isApiDocMemberFocused = function (memberName) {
     var apiDocFocusedMember = window.location.hash.replace('#!#', '').replace('-anchor', '');
     return apiDocFocusedMember === memberName;
   };
@@ -62,4 +62,17 @@ angularIO.controller('AppCtrl', ['$mdDialog', '$timeout', '$http', '$sce', funct
 
   // TRIGGER PRETTYPRINT AFTER DIGEST LOOP COMPLETE
   $timeout(prettyPrint, 1);
-} ]);
\ No newline at end of file
+
+  vm.sourceVisible = debugging;
+  vm.toggleSource = function ($event) {
+    $event.preventDefault();
+    vm.sourceVisible = !vm.sourceVisible;
+    var nodes = document.querySelectorAll('.original-english');
+    var $nodes = angular.element(nodes);
+    if (vm.sourceVisible) {
+      $nodes.removeClass('hidden');
+    } else {
+      $nodes.addClass('hidden');
+    }
+  };
+}]);
diff --git a/public/resources/js/translate.js b/public/resources/js/translate.js
index 671c856f97..5e850fb97e 100644
--- a/public/resources/js/translate.js
+++ b/public/resources/js/translate.js
@@ -1,24 +1,41 @@
-(function () {
+var debugging = location.hostname === 'localhost';
+(function ($) {
   var nodes = document.querySelectorAll('p, li, h1, h2, h3, h4, h5, h6, header, a, button, small');
   _.each(nodes, function (node) {
-    if (isTranslationResult(node)) {
-      var prevNode = node.previousElementSibling;
-      if (prevNode && isPureEnglish(prevNode.innerText) && !prevNode.classList.contains('nav-list-item')) {
-        if (location.hostname === 'localhost') {
-          prevNode.classList.add('original-english-debug');
-        } else {
-          prevNode.classList.add('original-english');
+    var prevNode = node.previousElementSibling;
+    if (!prevNode) {
+      return;
+    }
+    if (isTranslationResult(node, prevNode)) {
+      var $prevNode = $(prevNode);
+      var $node = $(node);
+      if (isPureEnglish($prevNode.text()) && !$prevNode.hasClass('nav-list-item')) {
+        $node.attr('id', prevNode.id);
+        $node.addClass('translated');
+        $node.addClass('translated-cn');
+        if (!$node.attr('title')) {
+          $node.attr('title', '点击译文可显示/隐藏原文；点击原文可隐藏原文');
         }
-        node.title = prevNode.innerText;
-        node.setAttribute('id', prevNode.id);
-        prevNode.removeAttribute('id');
-        node.classList.add('translated');
-        node.classList.add('translated-cn');
+        $prevNode.removeAttr('id');
+        $prevNode.addClass('original-english');
+        if (!debugging) {
+          $prevNode.addClass('hidden');
+        }
+        if (node.tagName !== 'A' && node.tagName !== 'BUTTON') {
+          $node.on('click', function () {
+            $prevNode.toggleClass('hidden');
+          });
+          $prevNode.on('click', function () {
+            $prevNode.addClass('hidden');
+          });
+        }
+        $node.after($prevNode);
       }
     }
   });
 
   function isPureEnglish(text) {
+    // accept &mdash; , quotes and façade too.
     return /^[\1-\255—’“”ç]*$/.test(text);
   }
 
@@ -41,7 +58,7 @@
       attributesToString(node1) === attributesToString(node2);
   }
 
-  function indexOf(node) {
+  function indexOfSameType(node) {
     var i = 0;
     var aNode = node.parentNode.firstChild;
     while (aNode !== node) {
@@ -54,8 +71,7 @@
     return i;
   }
 
-  function isTranslationResult(node) {
-    var prevNode = node.previousElementSibling;
-    return indexOf(node) % 2 === 1 && prevNode && isClonedNode(node, prevNode) && isPureEnglish(prevNode.innerText);
+  function isTranslationResult(node, prevNode) {
+    return indexOfSameType(node) % 2 === 1 && isClonedNode(node, prevNode) && isPureEnglish(prevNode.innerText);
   }
-})();
+})(angular.element);