调速仪

例句：

1. 1. The speedometer on the car is showing that it's going too fast.
   汽车上的转速表显示车速过快。
2. 2. The engineer used a speed governor to control the machine's speed.
   工程师使用一个调速器来控制机器的速度。
3. 3. The train was slowed down by the engineer who had installed a new speed governor.
   火车被工程师安装的新调速器减速了。