Perhaps as important is the relation between the existence of solutions to a competitive equilibrium and the problems of normative or welfare economics.
建筑应该诉说它的时代和地点，但渴望永恒。
The changes we dread most may contain our salvation.
如果我们足够明智地正确开发，未来的粮食安全就在海浪之下。
我被教导说，进步的道路既不迅速也不容易。
The language of mathematics is universal, transcending cultural and linguistic barriers.
You are no different than anybody else is.
The strength of a society lies in its ability to balance individual freedom with social cohesion.
你不能只做一次有效的事情，你周围的一切都在不断变化。要成功，就要走在变化的前面。