名词
中文翻译：往返运动
同义词：
['reciprocal motion', 'back-and-forth motion']
例句：
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1. Thecar's reciprocating engine makes it very quiet.
汽车的往复式发动机使它非常安静。
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2. During the long journey, the train made many reciprocating motions.
在漫长的旅程中，火车进行了很多次往复运动。
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3. The machine's reciprocating pump is used for cleaning oily substances.
这台往复泵用于清洗油类物质。