cog
[kɑ:g]
vt.& vi.
（用假骰子）欺骗，行贿;
（大机构中的）无足轻重的成员;
n.
钝齿;
雄榫;
例句:
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He was a cog in the machinery of early-modern society.
来自WSJ
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Mr Lake was an important cog in the Republican campaign machine.
莱克先生是共和党竞选机器中一枚重要的螺丝钉。
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The wheel engages with the cog and turns it.
轮子咬住轮齿并带动它转动。
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The front cog has 44 teeth.
前齿轮有44个齿。
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The injectors rattle like a sewing machine that's lost a cog.
来自WSJ
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Mr Vonderhaar's team's judgement on colour issues is helped by one highly innovative cog in the design process.
来自BBC