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。

The secret of all effective advertising is not the creation of new and tricky words and pictures, but one of putting familiar words and pictures into new relationships.

Sustainable fishing is not an option; it is an obligation for future generations.

领导力在于激励他人在看到障碍的地方看到可能性。

记忆是个棘手的东西，它既可以是祝福也可以是诅咒。

它让我如鱼得水。