Fluid motion caused by an external force such as gravity.
由重力等外力引起的流体运动。
Such motion can be regarded as a small scale violation of the second law.
可把这种运动看作是轻度违反第二定律。
A sudden abrupt motion, such as a yank or twist.
突然的意外动作，如猛拉或扭曲。
Joined various societies, such as English Association, the Motion Picture Association and so on.
加入了各种社团，如英语协会、电影协会等。
Joined various societies, such as English Association, the Motion Picture Association and so on.
加入了各种社团，如英语协会、电影协会等。
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