speed ratio controller

例句：

1. 1. The speed ratio controller is used to adjust the transmission's gear ratios.
   速度比控制器用于调整变速器的齿轮比。
2. 2. The engineer designed a new speed ratio controller for the car.
   工程师为汽车设计了一种新的速度比控制器。
3. 3. The speed ratio controller was responsible for maintaining the vehicle's optimalperformance.
   速度比控制器负责保持车辆的最佳性能。