anchor.diff:    例如，象下面这样，从`@angular/core`库中导入`Component`装饰器：
     
   +makeExample('src/app/app.component.ts', 'import', '')(format='.')
  +
   :marked
     You also import Angular _modules_ from Angular _libraries_ using JavaScript import statements:
     
     还可以使用 JavaScript 的导入语句从 Angular _库_中导入 Angular _模块_。
     
   +makeExample('src/app/mini-app.ts', 'import-browser-module', '')(format='.')
  +
   :marked
     In the example of the simple root module above, the application module needs material from within that `BrowserModule`. To access that material, add it to the `@NgModule` metadata `imports` like this.
     
  
positive.code: 
    :marked
      > [**Testing**](testing.html): Run unit tests on your application parts as they interact with the Angular framework
      using the _Angular Testing Platform_.> [**测试**](testing.html)：使用 _Angular 测试平台_，在你的应用部件与 Angular 框架交互时进行单元测试。
  
negative.code:   In TypeScript, you attach metadata by using a **decorator**.
    Here's some metadata for `HeroListComponent`:
  
    在TypeScript中，我们用**装饰器 (decorator) **来附加元数据。
    下面就是`HeroListComponent`的一些元数据。
  
  +makeExcerpt('src/app/hero-list.component.ts', 'metadata')
  