可以按照屏幕上的提示，选择小鸟，小车，或者退出．小鸟在天上飞，行减小．一个小动画，可供初学者参考-You can choose the little bird, the car or to exit according to the tips on screen. While the bird is flying on the sky, the row number reduces. It is a simple flash for the program beginer to reference.