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单词 掣爪
例句 DEFINITIVE EXAMPLES 权威例句〔pawl〕A hinged or pivoted device adapted to fit into a notch of a ratchet wheel to impart forward motion or prevent backward motion.掣爪,棘爪:一种枢轴或转轴器械,能与齿轮缺口或齿间吻合来前进或防止后移美国传统
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