The most sustainable product is the one that already exists.

The real difficulty lies not in devising new ideas, but in escaping from the old ones.

Real queens fix each other's crowns.

解读：健康是人生基石，一旦失去健康，再多财富、名誉都无福消受，警示人们莫因一时贪念，损害身体，权衡利弊时，把健康放首位。

如果没有地幔对流的概念，大陆漂移理论将只是一种猜测。

总统职位需要最大的勤奋和关注。