sprocket

名词 sprocket:

1. roller that has teeth on the rims to pull film or paper through
2. thin wheel with teeth that engage with a chain
   同义词：sprocket wheel
3. tooth on the rim of gear wheel
   同义词：cog

1. A device for shifting gears on a bicycle by moving the chain between sprocket wheels of different sizes.
   脱轨器，转撤器通过在不同大小的扣链齿轮间移动链条而转换自行车齿轮(换档)的装置
2. A tooth of a sprocket wheel.
   扣链齿链轮上的一个扣链齿