exhalation valve

例句：

1. 1.The engine needs to be checked for any signs of wear or damage.
   发动机需要检查是否有磨损或损坏的迹象。
2. 2. The car's exhaust system is a crucial part of the vehicle's performance.
   汽车的排气系统是车辆性能的关键部分。
3. 3.The technician replaced the worn out valve in the exhaust system.
   技术人员更换了排气系统中磨损的阀门。