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

A vida é um constante aprendizado.

The best way to get a project done faster is to start sooner.

将计算机带到家里不会改变任何一种，但可能会使角落的轿车焕发活力。

世界需要能源，但它比以往任何时候都更需要负责任的能源。

I think the world is in a state where we need to hear the truth.

你必须能够适应不断变化的市场条件。如果你不能适应，你就无法生存。