anchor.diff:          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)。
  +        调用`query(predicate: Predicate<DebugElement>)`返回子树所有层中所有匹配[predicate](#query-predicate)`DebugElement`。
     tr
       td(style="vertical-align: top") <code>injector</code>
       td
  
positive.code: 
    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。
  
    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.
  
negative.code:       :marked
          The `DebugElement` parent. Null if this is the root element.
  
          `DebugElement`的父级。如果`DebugElement`是根元素，`parent`为null。
  
    tr
      td(style="vertical-align: top") <code>name</code>
  