自然在其现象中向我们展示了一条不间断的类比链。
The said truth is that it is the greatest happiness of the greatest number that is the measure of right and wrong.
Success is great, but the real reward is making people happy with our music.
模型的目的是足够简单以便理解和使用,但又足够复杂以捕捉系统的基本特征。