当旋转这个边时，这个角就不再是直角了。

When we rotate this side here, but the Angle doesn't stay at a right Angle.

youdao

当旋转双音符时，前臂应放两个内指之间的中心位置。

While rotating double notes, the forearm should be in a central position between the two innermost fingers.

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这样做会让手臂受力不均但是当旋转腿向前幅度会更大。

The forces down the arms become uneven when this is done but provides for a larger motion when swinging the leg forward.

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now I'm really fantastic at drawing this mechanical device, but you can imagine that dropping a weight can cause a paddle wheel to turn.

机械装置的时候,我真的很着迷，你可以想象,当重物掉落的时候会带动桨轮旋转。

麻省理工公开课 - 热力学与动力学课程节选

When we have just a single bond in them molecule, you have all the free rotation you want, you can just spin it around, there's nothing keeping it in place.

当我们在分子力只有一个单键时，你可以随意旋转，你可以让它转起来，没有什么东西能固定住它。

麻省理工公开课 - 化学原理课程节选