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如果拖拉机后面拖挂的部分也需要动力,那它也是通过自身与地面接触的轮来实现驱动,与其被牵引的方式一样。如果有一个单独的驱动力直接作用在轮子上,
If the trailing part of the tractor also requires power, it is also driven by its own wheel in contact with the ground, just as it is towed. If there is a single driving force acting directly on the wheel,