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front derailleur /ˈfɹʌnt dɪɹˈeɪlɜː/ n

中文：前变速器

中文 · 前变速器Español · cambio de marchas delanteroFrançais · dérailleur avant
Meaning：Mechanism for changing the front gears by lifting the chain from one chain wheel to another; it allows the cyclist to adapt to road conditions.
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Bicycle parts Drivetrain

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