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

中心地的规模和分布遵循一定的规律。

There is no death, daughter. People die only when we forget them.

Diversity in thought leads to innovation in action.

无论大自然为人类准备了什么，无论多么不愉快，人类都必须接受，因为无知从来都不比知识更好。