Clap your hands and move your arms and legs from time to time.

时不时拍拍手，摆摆臂，动动腿。

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Move your arms in a wave like movement.

象波浪的运动那样移动你的胳膊。

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If you can't see your fingers, then move your arms inward until you can.

如果看不到手指，就向内移动手臂直到直到看见为止。

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You need energy to move your arms around and move around mechanical systems, obviously, cars, boats, etcetera.

你需要能量,来移动胳膊和走动,机械系统，汽车，船等等。

麻省理工公开课 - 热力学与动力学课程节选