anchor.diff:    The `*` ("wildcard") state matches *any* animation state. This is useful for defining styles and
     transitions that should apply regardless of which state the animation is in. For example:
   
  -  `*`(通配符)状态匹配*任何*动画状态。当定义那些不用管当前处于什么状态的样式及过渡时，这会很有用。比如：
  +  `*`(通配符)状态匹配*任何*动画状态。当定义那些不需要管当前处于什么状态的样式及转场时，这很有用。比如：
   
     * The `active => *` transition applies when the element's state changes from `active` to anything else.
   
  -  * 当该元素的状态从`active`变成任何其它状态时，`active => *`过渡就会生效。
  +  * 当该元素的状态从`active`变成任何其它状态时，`active => *`转场都会生效。
   
     * The `* => *` transition applies when *any* change between two states takes place.
   
  -  * 当*任何*两个状态之间切换时，`* => *`过渡就会生效。
  +  * 当在*任意*两个状态之间切换时，`* => *`转场都会生效。
   
   figure.image-display
     img(src="/resources/images/devguide/animations/ng_animate_transitions_inactive_active_wildcards.png" alt="The wildcard state can be used to match many different transitions at once" width="400")
  
positive.code:   sets of styles to a more intricate animation that goes through one or more
    intermediate styles in between.
  
    通过定义动画的*关键帧*，我们可以把两组样式之间的简单过渡，升级为一种更复杂的动画，它会在转场期间经过一个或多个中间样式。
  
    For each keyframe, we can specify an *offset* that defines at which point
    in the animation that keyframe applies. The offset is a number between zero,
    which marks the beginning of the animation, and one, which marks the end.
  
    对于每个关键帧，我们都可以指定一个*偏移量*，用来定义该关键帧应该被用在动画期间的哪个时间点。偏移量是一个介于0(表示动画起点)和1(表示动画终点)之间的数组。
  
    In this example we add some "bounce" to our enter and leave animations with
    keyframes:
  
negative.code:   Using the `void` and `*` states we can define transitions that animate the
    entering and leaving of elements:
  
    使用`void`和`*`状态，我们可以定义元素进场与离场时的转场动画：
  
    * Enter: `void => *`
  
  