anchor.diff:    
     `CrisisModule`和本模块非常像，我们不再赘述。
   
  -  <live-example embedded plnkr="pre-shared.3" img="devguide/ngmodule/v3-plunker.png">Try the live example.</live-example>
  -  
     <live-example embedded plnkr="pre-shared.3" img="devguide/ngmodule/v3-plunker.png">试试在线例子。</live-example>
   
   a#shared-module
  
positive.code:   We ran into trouble [above](#import-name-conflict) when we declared the contact's `HighlightDirective` because
    we already had a `HighlightDirective` class at the application level.
    
    [以前](#import-name-conflict)我们要声明联系人的`HighlightDirective`指令时遇到了问题，因为在应用程序一级已经有了一个`HighlightDirective`类。
  
    That both directives have the same name smells of trouble.
    
  
negative.code:   :marked
      The real problem is that there are _two different classes_ trying to do the same thing.
      
      真正的问题在于，有_两个不同的类_试图做同一件事。
  
      It's OK to import the _same_ directive class multiple times. 
      Angular removes duplicate classes and only registers one of them.
  