单词：alternating motion
alternating 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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