画了四个物体:球体，正方体，圆球，圆柱体，再画出一面镜子，可以看到镜子里自己的像。可以移动鼠标旋转查看，也可以通过按键A, D, F ,R 来控制旋转等功能。-Drew four objects:sphere,cube,sphere,cylinder, and then drew a mirror,you can see the image of their own. You also can move the mouse to ro