Collaboration is key in science—no breakthrough happens in isolation.

All are gurus to us, the wicked by their evil deeds say 'do not come near me'. The good are always good, therefore all are like gurus to us.

荣枯互为倚伏，心田开合一切由己，顺与逆顺其自然，何必去问别人？长与短，四时运行，长寿或短命，一切都是自然而成，何必去怪别人。

美国以其广阔的能力，能够在其境内容纳地球上所有的人口。

自然和历史是地理知识的两个重要来源。