软件的复杂性是一个本质属性，而不是偶然的。

The work of art is a whisper of the cosmos.

我不是士兵，我不是战士，我只是一个讲故事的人。

成功辨识的关键是找到一个足够灵活的模型结构，以捕捉系统的基本特征，同时又足够简单，可以从现有数据中估计出来。

A human being needs to suffercWhen one suffers， one becomes strong.

Children have real understanding only of that which they invent themselves, and each time that we try to teach them something too quickly, we keep them from reinventing it themselves.