When we have pure roll, the velocity of this point Q, and the velocity of the circumference, - if you can read that — are the same.
在纯滚动情况下，Q的速度，和圆周的速度，如果你们看得到-，是相同的。
When we have pure roll, the velocity of this point Q, and the velocity of the circumference, - if you can read that — are the same.
在纯滚动情况下，Q的速度，和圆周的速度，如果你们看得到-，是相同的。
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