In a normal car it is a mechanical system that changes the wheel speed.
在普通汽车里，这是机械系统可以做到的，用来改变两个轮的速度。
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。
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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