地理带的研究揭示了自然界的统一性，尽管它表面上看起来多样。

The most important part of teaching is to teach what it is to know.

发现的兴奋感永远不会消退。

"In the midst of winter, I found there was, within me, an invincible summer."

这是圣王的法则,治理天下的正道,不可不努力去做！