名词
中文翻译：阀门升降凸轮
同义词：
['valve lifter', 'valve actuator']
例句：
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1.The valve-lifting cam is responsible for adjusting the flow of oil in the engine.
阀门升降凸轮负责调整发动机中油的流动。
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2. The valve-lifting cam is a crucial component of the fuel injection system.
阀门升降凸轮是燃油喷射系统的关键部件。
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3. The valve-lifting cam was designed to improve fuel efficiency and reduce emissions.
阀门升降凸轮的设计旨在提高燃油效率并减少排放。