国家本质上是侵略性和扩张主义的，因为它们存在于一个无政府状态的国际体系中，没有更高的权威来约束它们。

You have to be willing to fail to be successful.

让孩子留在家里的最好方法是让家庭氛围愉快——并且把轮胎的气放掉。

The best leaders are those most interested in surrounding themselves with assistants and associates smarter than they are.

海洋保护区就像是鱼类种群的储蓄账户。