说明：  整个设计包括两个方面，一是掌握动画的基本原理，二是圆的绘制。动画是将静止的画面变为动态的艺术。实现由静止到动态，主要是靠人眼的视觉残留效应。利用人的这种视觉生理特性可制作出具有高度想象力和表现力的动画影片。
(The whole design includes two aspects, one is to master the basic principles of animation, the other is to draw the circle. Animation is the art of turning a still picture into a dynamic one. The realization from static to dynamic mainly depends on the visual residual effect of human eyes. Using this kind of visual physiological characteristics of human beings, we can make animated films with high imagination and expressiveness.)