Perhaps as important is the relation between the existence of solutions to a competitive equilibrium and the problems of normative or welfare economics.

梦想是免费的，但奋斗需要付出代价。

语言是最强大的武器；它们可以建立帝国，也可以摧毁帝国。

Leadership is about making others better as a result of your presence and making sure that impact lasts in your absence.

世界不是一个需要解决的问题；它是一个我们所属的生命体。

要说“我爱你”，首先必须能够说“我”。