Every mental state exists for a purpose; to understand it, we must ask what function it serves in the broader system of behavior.

我们开采的每一桶石油都必须以最小的环境影响负责任地进行。

The computer is a tool, not a substitute for thinking.

Music has no borders, it can connect everyone's hearts.

戏剧不是散文，也不应该被当作散文来对待。

数学研究是具体与抽象之间不断的对话。