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down tube /dˌaʊn ˈtjuːb/ n

中文：车架下管

中文 · 车架下管Español · tubo inferior del cuadroFrançais · tube oblique
Meaning：Part of the frame connecting the head tube to the pedal mechanism; it is the longest and thickest tube in the frame and gives it its rigidity.
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Bicycle parts

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