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。

最有力的艺术是不试图有力的艺术。

Technology leaders must understand both technology and human nature.

Liberal democracy may constitute the "end point of mankind's ideological evolution" and the "final form of human government."

The documenta is a celebration of the human spirit.

法律体系的存在以承认规则的存在为前提。