单词：mass point
mass point的用法和样例：
例句
- A particle has no extent so that its position is a point.质点没有广度因此它的位置是一个点。
- One instance of simple harmonic motion is that of the projection on any diametre of a point which describes a circular path with uniform angular velocity.当一质点以匀角速度作圆周运动时，则它在任意直径上的投影的运动便是简谐运动的一例。
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