减速剂

例句：

1. 1. The car's engine needs a deceleratorto slow down.
   汽车的引擎需要减速器来减速。
2. 2. The chemical used as adecelerator is called glycerol.
   用作减速剂的化学物质叫做甘油。
3. 3.The brake system uses a deceleratorto control the vehicle's speed.
   刹车系统使用减速器来控制车辆的速度。