习惯的强度是其被强化次数的函数。

最伟大的发现是人类可以通过改变心态来改变生活。

The individual investor should act consistently as an investor and not as a speculator.

What you do is infinitely more important than how you do it.

中心地的等级越高，其服务的区域越大，此类中心地的数量越少。