anchor.diff:  :marked
     ## Step 2: Our first Angular component
   
  +  ## 步骤2：第一个Angular组件
  +
     Let's create a folder to hold our application and add a super-simple Angular component.
   
     创建一个文件夹，用于保存应用程序，并且添加一个超级简单的Angular组件。
  
positive.code:   .l-main-section#ngmodule
    :marked
      ## Step 3: Our own `app.module.ts`
      ## 第三步：创建`app.module.ts`
  
      We compose Angular apps into closely related blocks of functionality with [Angular Modules](guide/ngmodule.html).
      Every app requires at least one module, the _root module_, that we call `AppModule` by convention.
  
negative.code: 
  .l-main-section#build-and-run
  h2 Step !{step++}: Build and run the app!
  h2 步骤6：构建并运行本应用！
  block run-app
    :marked
      Open a terminal window and enter this command:
  