self-reducing tachometer

例句：

1. 1. The self-reducing tachometer is an essential tool for monitoring engine performance.
   自降式转速表是监测发动机性能的必备工具。
2. 2.The engineer used the self-reducing tachometer to quickly diagnose the issue with the transmission.
   工程师使用自降式转速表迅速诊断了变速器的问题。
3. 3.During maintenance, the technician replaced the faulty self-reducing tachometer with a new one.
   在维护过程中，技术人员用一个新的自降式转速表替换了故障的转速表。