one of a series of teeth on the edge of a wheel that fit between the teeth on the next wheel and cause it to move （齿轮的）轮齿，嵌齿
cogwheel
Link to original
one of a series of teeth on the edge of a wheel that fit between the teeth on the next wheel and cause it to move （齿轮的）轮齿，嵌齿
cogwheel
Link to original
