一个中介可以与一个或多个目的地相关，而且在消息到达该目的地时立即被调用。
A mediation is associated with one or more destinations, and will be invoked as soon as a message arrives at that destination.
不管你是到达了目的地，还是在到达下一个地点时便宜买来或免费得到的，这些盒子都能再次得到回收利用。
They can be popped in a recycling bin when you arrive and bought cheaply or had for free when you get to the other end.
使用一个真实类比，当您乘飞机旅行时，要签入托运大件行李且只要在到达中转点或目的地时才领取它们。
Using a real life analogy, when you travel by air, you check-in large pieces of luggage and only claim them when you reach a transfer point or your destination.
第一，当避开包括其他行人在内的障碍时，每个人都试图尽量以直线的的路线到达目的地，就像一个出口或一个走廊的尽头。
The first was that each attempted to chart as straight as possible a path to his destination, such as an exit or the end of a corridor, while avoiding obstacles, including other pedestrians.
这些层可以被动态的增加或删除，你也可以对这些层进行改动，因为每层都有一个轨道，你可以在轨道中的特定时间点加入关键帧到达改变动画的目的。
These layers and be added or removed dynamically and you can change each layer as it has a track that lets you change it as a function of time by inserting keys at certain frames in the track.
这些层可以被动态的增加或删除，你也可以对这些层进行改动，因为每层都有一个轨道，你可以在轨道中的特定时间点加入关键帧到达改变动画的目的。
These layers and be added or removed dynamically and you can change each layer as it has a track that lets you change it as a function of time by inserting keys at certain frames in the track.
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