valve-lifter cam

例句：

1. 1.The valve lifter is responsible for controlling the flow of oil through the engine.
   阀门提升器负责控制油通过发动机的流量。
2. 2. The valve lifter cam was designed to improve fuel efficiency by reducing air leakage.
   阀门提升器凸轮设计用来减少空气泄漏，以提高燃油效率。
3. 3. The valve lifter cam was replaced with a new one after it failed during testing.
   在测试中阀门提升器凸轮失败后，我们更换了一个新的。