drop valve gear

例句：

1. 1. The drop valve gear is crucialfor maintaining the pressure in the system.
   减压阀齿轮对于保持系统压力至关重要。
2. 2. The engineers were tasked with replacing the olddrop valve gear with new ones.
   工程师们被指派用新的代替旧的减压阀齿轮。
3. 3. The drop valve gear was designedto minimize the risk of leakage duringoperation.
   减压阀齿轮设计成在操作过程中最小化泄漏风险。