邪恶是任何分散注意力的东西。

客户的忠诚是赢得的，而不是给予的。

自然实验是理解现实世界中因果关系的强大工具。

The boundaries which divide Life from Death are at best shadowy and vague. Who shall say where the one ends, and where the other begins?

The value or worth of a man is, as of all other things, his price; that is to say, so much as would be given for the use of his power.

语言教学的本质在于思维能力的培养，而不仅仅是知识的积累。