名词
中文翻译：Unknown
同义词：
['reciprocating', 'reciprocating engine']
例句：
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1.The rotary valve is responsible for controlling the flow of gases in the engine.
旋转阀负责控制发动机中气体的流量。
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2.The rotary pump is used to circulate oil in the engine.
旋转泵用于在发动机中循环油。
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3. The rotary screw drives the pistons up and down in the cylinder.
旋转螺杆驱动活塞在气缸内上下运动。