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7_12
- 在窗口中显示一个球，该球以与水平成45度夹角作直线运动，当遇到边界时，反弹回来，仍与水平成45度角继续运动。-In the window of a ball, the ball with the level of 45 degrees angle for linear motion, when faced with the border, the rebound came back, still with the level of 45-degree angle to continue to c