我让它在狭槽中运动。
我会通过同一狭槽，这样安排电子设备，以使它回到同一狭槽时，它会开始计时。
It will go back through the same slot, and the electronics is arranged in such a way that when it goes back through the same slot that it will initiate this time.
该腔室有一个很纤细的偏心气缸，它可以旋转以使唤得下部或者上部狭槽的气流更强。
This chamber contains a slightly eccentric cylinder which can be rotated to make either the upper or the lower slots bigger.
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