retarder thinner

例句：

1. 1.The engineer designed a device to slow down the vehicle's speed.
   工程师设计了一种装置来减缓车辆的速度。
2. 2. The retarder was installed in the car to prevent it from moving too fast on the highway.
   在汽车上安装了减速器，以防止它在高速公路上行驶过快。
3. 3.The retarder is essential for maintaining the balance of the vehicle during acceleration.
   减速器对于保持车辆加速时的平衡至关重要。