Through changes the driving gear and the driven wheel transmission belt's contact radius carries on the speed change.

通过改变驱动轮与从动轮传动带的接触半径进行变速。

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Through changes the driving gear and the driven wheel transmission belt's contact radius carries on the speed change.

通过改变驱动轮与从动轮传动带的接触半径进行变速。

youdao