rotatrol

例句：

1. 2.动词：控制
   机器或设备
2. 1. The rotatrol on the car's steering wheel controls the speed of the car.
   汽车方向盘上的旋钮控制着汽车的速度。
3. 2. The engineer used a rotatrol to adjust the gear ratio of the engine.
   工程师使用一个旋转控制器来调整发动机的齿轮比。
4. 3. The scientist developed a new rotatrol that could reduce fuel consumption by up to 20%.
   科学家开发了一种新型旋转控制器，可以降低燃油消耗高达20%。