anchor.diff:  
     The `DebugElement` provides crucial insights into the component's DOM representation.
   
  -  `DebugElement`提供了对组件的DOM提供了访问渠道。
  +  `DebugElement`提供了对组件的DOM的访问。
   
     From the test root component's `DebugElement`, returned by `fixture.debugElement`, 
     you can walk (and query) the fixture's entire element and component sub-trees.
  
positive.code:         Calling `queryAll(predicate: Predicate<DebugElement>)` returns all `DebugElements`
          that matches the [predicate](#query-predicate) at any depth in subtree.
  
          调用`query(predicate: Predicate<DebugElement>)`返回所有`DebugElement`，
          它在子树所有层中匹配[predicate](#query-predicate)。
    tr
      td(style="vertical-align: top") <code>injector</code>
      td
  
negative.code:         Calling `query(predicate: Predicate<DebugElement>)` returns the first `DebugElement`
          that matches the [predicate](#query-predicate) at any depth in the subtree.
  
          调用`query(predicate: Predicate<DebugElement>)`返回子树所有层中第一个匹配[predicate](#query-predicate)的`DebugElement`。
    tr
      td(style="vertical-align: top") <code>queryAll</code>
      td
  