单词：reciprocating piston engine
reciprocating piston engine的用法和样例：
例句
- It is also generally conceded that Wankel engines are quieter than comparable piston engines.转子发动机比通常的活塞式发动机噪音小也是大家所公认的。
- In a radial engine all the cylinders are set in a circle and all point toward the center of the circle.在径向式发动机里，所有的气缸都布置在一个圆圈里，而且都指向圆心。
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