engine hourmeter

例句：

1. 1.The engineer used the engine hourmeter to monitor the engine's performance.
   工程师使用发动机小时计来监测发动机的性能。
2. 2.The car's engine hourmeter showed that it had been running for over an hour.
   汽车的发动机小时计显示它已经运行了超过一个小时。
3. 3. The mechanic checked the engine hourmeter before starting the engine.
   在启动发动机之前，技师检查了发动机小时计。