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。

I'm not gonna sing about love if I don't feel it.

All things are possible until they are proved impossible and even the impossible may only be so, as of now.

死亡不算什么，但每天生活在失败和没有荣耀中就是每天都在死去。

"A good book is a friend that never lets you down."

To mount the scaffolds,To advance to the muzzle of guns with perfect nonchalance.

我不相信有罪恶的快乐——如果你喜欢某样东西，就享受它。