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TOEFL BNC: 20326 COCA: 17219

one of the tooth-like parts around the edge of a wheel in a machine that fits between those of a similar wheel, causing both wheels to move(齿轮的)嵌齿,轮齿

also cogwheel a wheel with cogs around its edge, used to turn another wheel or part in a machine齿轮

TOEFL BNC: 20326 COCA: 17219
TOEFL BNC: 20326 COCA: 17219
TOEFL BNC: 20326 COCA: 17219
cog
Unimportant person or people: nonentity, lightweight, mediocrity...

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