- n. 扣链齿;扣链齿轮
以上来源于:《英汉大辞典》
n.
- 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.
- (also sprocket wheel) a wheel with projections of this kind.
Etymology
C16 (denoting a triangular piece of timber used in a roof): of unknown origin.
以上来源于:《简明牛津英语词典》