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词汇 ratchet-wheel
释义 ratchet-wheel 英'rætʃɪtw'iːl美'rætʃɪtw'iːl
基本英英
n.棘轮¹⁰⁰

名词 ratchet wheel:
toothed wheel held in place by a pawl or detent and turned by a lever
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