Sprocket



GRE

解释

GRE 红宝书

• n. 链轮
• ［英］ n. 链轮 ( a wheel with a row of teeth for fitting into and turning a bicycle chain)

Webster Collegiate

noun

• Etymology: origin unknown
• Date: 1886
• 1. a toothed wheel whose teeth engage the links of a chain
• 2. a cylinder with teeth around the circumference at either end that project through perforations in something (as motion-picture film) to move it through a mechanism (as a projector)

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