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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在此转载测试，PCB是印刷和删除输出输送轨道，运回转载输入跟踪没有任何干预。

In this reprint test, the PCB is printed and removed from the output conveyor track and transported back to the input track for reprint without any intervention.

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stream如何删除当前轨道才开始一个新的吗？

Sc. stream - How to remove current Track before starting a new one? sc.

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