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bottom bracket axle /ˈbɒtəm ˈbɹakɪt ˈaksəl/ n

中文：中轴

中文 · 中轴Español · eje del pedalFrançais · axe du pédalier
Meaning：Tube to which the crank is attached at each end so that one end is up when the other is down.
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Drivetrain

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