The first ball the fastest, from the first ball to the sixth ball speed gradually decreases, and the direction is counterclockwise movement of the ball, the ball is the seventh clockwise movement.
第一个球最快，从第一个球到第六个球速度逐渐递减，且球的运动方向是逆时针，第七个球是顺时针运动。
The first ball the fastest, from the first ball to the sixth ball speed gradually decreases, and the direction is counterclockwise movement of the ball, the ball is the seventh clockwise movement.
第一个球最快，从第一个球到第六个球速度逐渐递减，且球的运动方向是逆时针，第七个球是顺时针运动。
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