n. 
速齿轮

词
n.
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fall through,
fall to doing,
fall to pieces,
fall under,
fallacious,
fallaciously,
fallacy,
fallage,
fallal,
fal-lal,
相似单词
differential calculus,
differential coefficient,
differential cost,
differential diagnosis,
differential equation,
differential gear,
differentially-wound,
differentially-woundbell,
differentialseparation,
differentialsmoothing,