valve rocker arm spring

例句：

1. 1.The new valve rocker has a much better performance than the old one.
   新的阀门摇臂性能比旧的要好得多。
2. 2.The rocker arm spring is responsible for controlling the movement of the piston in the engine.
   摇臂弹簧负责控制发动机活塞的运动。
3. 3.The spring was replaced after it broke during the heavy rain.
   在大雨中，弹簧断裂后被更换了。