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BNC: 0 COCA: 16558
derailleurnoun [ C ]uk/dɪˈreɪl.jer/ us/dɪˈreɪ.lɚ/ specialized

a type of bicycle gear that works by moving the bicycle chain from one sprocket wheel (= a wheel with a row of tooth-like parts) to another(自行车的)换挡装置,变速器

Set the rear derailleur in the lowest gear, with the chain on the biggest sprocket wheel at the back.把后轮的变速器调到最低挡,就是让链条在后面连到最大的链齿上。
derailleur gears换挡齿轮

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