农业的进步不仅要以产量衡量，还要以长期的环境影响来衡量。

The improvement of understanding is for two ends: first, our own increase of knowledge; secondly, to enable us to deliver that knowledge to others.

我希望网络为人类服务。它应该是让生活更美好的东西。

Your time is limited, so don't waste it living someone else's life.

Ignorance is easier to get than knowledge.

语言的研究最终是对人类心灵的研究。