自然和历史是地理知识的两个重要来源。

化学最令人兴奋的地方在于能够创造出从未存在过的新分子。

The duties of all public officers are, or at least admit of being made, so plain and simple that men of intelligence may readily qualify themselves for their performance.

生存的唯一方法就是不断前进。

The fool doth think he is wise, but the wise man knows himself to be a fool.

Every failure is a lesson that brings us closer to success.

不可以同井底的青蛙谈论大海的辽阔，因为有空间的拘束；不可以同夏天的小虫谈论冰冻的寒冷，因为有时节的局限。