n.

1. 扣链齿
2. 扣链齿轮
   The sprocket chain on my motorcycle broke loose, and I am trying to fix it.

   我摩托车上的扣链齿轮松了，我正在想办法修理。

n.

1. each of several projections on the rim of a wheel that engage with the links of a chain or with holes in film, tape, or paper.
2. (also sprocket wheel) a wheel with projections of this kind.