| 单词 | sprocket | 
| 释义 | Word Frequency sprocket(ˈsprɒkɪt) noun 1.  Also called: sprocket wheel a relatively thin wheel having teeth projecting radially from the rim, esp one that drives or is driven by a chain  2.  an individual tooth on such a wheel 3.  a cylindrical wheel with teeth on one or both rims for pulling film through a camera or projector  4.  a small wedge-shaped piece of wood used to extend a roof over the eaves  Word origin C16: of unknown origin | 
	
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