press SPACE to create more balls click ball to remove it Just to show bouncing between cloned balls 按空格产生更多的小球 点击小球可删除之 本程序仅仅是展示克隆体相互碰撞检测的一种方案
Simple, but sometimes balls stick to each other. Can you remix it to show a perfect solution to avoid balls overlapping. 本方案简单但是有时候不正确，请高手修正之
