cog

1 each of a series of teeth on the edge of a wheel, that fit between those of a similar wheel, so that each wheel can cause the other one to move （齿轮的）轮牙; 轮齿. =>illus 见插图. 2 (idm 习语) a cog in the ma`chine (infml 口) person who plays a necessary but small part in a large organization or process 不重要的但不可少的人.

coeducation, coeducational, coefficient, coerce, coercion, coercive, coeval, coexist, coexistence, coffee, coffee bar, coffee bean, coffee grinder (also `coffee-mill), coffee shop, coffee tree, coffee-house, coffee-pot, coffee-table, coffer, coffin, cog-railway, cog-wheel, cogency, cogent, cogently, cogitate, cogitation, cognac, cognate, cognition, cognitive, cognizance, cognizant, cognoscente, cohabit, cohabitation, cohere, coherence, coherent, coherently,