Fluid motion caused by an external force such as gravity.
由重力等外力引起的流体运动。
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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