check valve seat

例句：

1. 1. The engineerchecked the valve seat before starting the engine.
   工程师在启动发动机前检查了阀门座。
2. 2. The technician replaced the worn-outvalve seat with a new one.
   技师用一个新的阀门座替换了磨损的阀门座。
3. 3. The maintenance crew inspected the entiresystem for any signs of damage to thevalve seats.
   维修团队检查了整个系统，寻找任何阀门座损坏的迹象。