[机] 交变运动

alternate motion的用法和样例：

例句

The steam-engine piston makes a cyclic motion.蒸汽机活塞做往复运动。
This is a mechanism using a slider to transit a rotation to reciprocating the linear motion skimpily.此机构利用一滑槽，即可简单的将圆周运动转成直线的简谐往复运动。

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