对任何模型的最大期望是它能提供一个对现实有用的近似。
"I don't want to just be a singer. I want to be an entertainer."
创新不仅仅是创造新事物;而是让现有的变得更好。
The task of economics is not only to interpret phenomena, but also to provide practical advice and policies for society.
Problem solving is the central activity of intelligent systems.