anchor.diff:      Angular's core [`@Component` decorator function](../latest/api/core/index/Component-decorator
       .html).
       * **一个import语句**。它让你能访问Angular核心库中的[`@Component`装饰器函数](../latest/api/core/index/Component-decorator.html)。
  +
       * **A @Component #{_decorator}** that associates *metadata* with the
           `AppComponent` component class:
  +
       * **一个@Component#{_decoratorCn}**，它会把一份*元数据*关联到`AppComponent`组件类上：
   
           - a *selector* that specifies a simple CSS selector for an HTML element that represents
             the component.
  +
           - *selector*为用来代表该组件的HTML元素指定一个简单的CSS选择器。
  +
           - a *template* that tells Angular how to render the component's view.
  +
           - *template*用来告诉Angular如何渲染该组件的视图。
  -    * **A component class** that controls the appearance and behavior of a view
  -    * **组件类**通过它的模板来控制视图的外观和行为
  -    
  -    through its template. Here, you only have the root component, `AppComponent`. Since you don't
  +
  +    * **A component class** that controls the appearance and behavior of a view through its template. Here, you only have the root component, `AppComponent`. Since you don't
       need any application logic in the simple QuickStart example, it's empty.
  -    
  -    这里，你只有一个根组件`AppComponent`。由于这个简单的QuickStart范例中并不需要应用逻辑，因此它是空的。
  +
  +    * **组件类**通过它的模板来控制视图的外观和行为。这里，你只有一个根组件`AppComponent`。由于这个简单的QuickStart范例中并不需要应用逻辑，因此它是空的。
   
     You *export* the `AppComponent` class so that you can *import* it into the application that you
      just created.
  
positive.code: 
  .l-main-section#make-changes
  h1 Step !{step++}: Make some live changes
  :marked
    Try changing the message in `app/app.component.ts` to "My SECOND Angular 2 App".
  
  
negative.code: 
  .l-main-section#build-and-run
  h1 Step !{step++}: Build and run the application
  h1 步骤6： 编译并运行应用程序
  block run-app
    :marked
      Open a terminal window and enter this command:
  