说明：  一个全自动的反弹球，不用角度控制反弹，以小球是顺时针还是逆时针，及4种进入方向自动判断反弹结果，可以用鼠标在面版上画强，与先前的小球随机移动不同。
(an automatic rebound the ball, not control the rebound angle, the ball is a small clockwise or counterclockwise. and four types of automatic judgment entered rebound in the direction of the results, you can use the mouse version of the face-painting, with the previous small balls of different random movement.)