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rear derailleur /ˈɹiə dɪɹˈeɪlɜː/ n

中文：后变速器

中文 · 后变速器Español · cambio de marchas traseroFrançais · dérailleur arrière
Meaning：Mechanism for changing the rear gears by lifting the chain from one gear wheel to another; it allows the cyclist to adapt to road conditions.
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Bicycle parts Drivetrain

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