The purpose of a model is to be simple enough to understand and use, but complex enough to capture the essential features of the system.
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。
In darkness, we learn to seek light; in despair, we learn to seek hope.
世界上充满了神奇的事物,耐心地等待着我们的感官变得更加敏锐。
我不遵循规则。我制定规则。
最好的书是那些让你在读完时与开始时有些不同的书。