So, that point starts falling back behind the point of contact because the wheel is rotating at the same time as it's moving forward.
这个点开始落到切点的后面,因为车轮滚动的同时也向前运动。
So, that point starts falling back behind the point of contact because the wheel is rotating at the same time as it's moving forward.
这个点开始落到切点的后面,因为车轮滚动的同时也向前运动。
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