There is no man, however wise, who has not at some period of his youth said things, or lived in a way the consciousness of which is so unpleasant to him in later life that he would gladly, if he could, expunge it from his memory.
无论多么聪明的人，在他年轻时都曾说过或做过一些事情，后来回想起来会感到不快，以至于如果可能的话，他会很高兴地从记忆中抹去。
A true friend stabs you in the front.
国家是理性的行为体，它们寻求最大化相对权力，以确保在竞争性的国际体系中生存。
如果没有地幔对流的概念，大陆漂移理论将只是一种猜测。
众所周知，被归为成功原因的相同环境和机会，同样可以被视为其结果。