retarding disc

例句：

1. 1.The car's engine is retarding the wheels to slow down.
   汽车的引擎正在减速轮子以减缓速度。
2. 2.The brake disc is worn out, and it needs to be replaced.
   刹车盘磨损了，需要更换。
3. 3.The engineer used a retarding disc to control the speed of the vehicle.
   工程师使用减速盘来控制车辆的速度。