de·rail·leur 
(dĭ-rālər)
(dĭ-rālər)n.
A device for shifting gears on a bicycle by moving the chain between sprocket wheels of different sizes.
[French dérailleur, from dérailler, to derail; see DERAIL.]
| 单词 | derailleur |
| 释义 | de·rail·leur (dĭ-rālər)n. A device for shifting gears on a bicycle by moving the chain between sprocket wheels of different sizes. [French dérailleur, from dérailler, to derail; see DERAIL.] |
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