And I can therefore calculate S and what the velocity So what is the velocity in the x direction at point s?
然后我可以推测出,点在x轴方向的速度，what，the，velocity,在y轴方向的速度,那么在S点的x轴方向的速度,是多少呢？
And I can therefore calculate S and what the velocity So what is the velocity in the x direction at point s?
然后我可以推测出,点在x轴方向的速度，what，the，velocity,在y轴方向的速度,那么在S点的x轴方向的速度,是多少呢？
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