clutch pinion

例句：

1. 1. The car's engine is connected to the transmission through a clutch.
   汽车的发动机通过离合器连接到变速器。
2. 2. The gears on the steering wheel are designed to move the pinion, which in turn rotates the wheels.
   方向盘上的齿轮设计用来移动齿轮，而齿轮又带动车轮旋转。