老鼠和滚球游戏，是我根据自己的意愿，是为了我将要说明的下面有关内容而设置的。由于没有经过具体实践，我并不能保证其趣味性和吸引力，我们学习的是它实现过程中的一些思想-Mice and bowling games, that I according to their own will, for I am going to explain the contents of the following set up. After the absence of concrete practice, I can not guarantee that its interesting and attractive, we are learning is that it realize some of the thinking process.