"Ben approached a financial system on the verge of collapse with calm and wisdom, with bold action and out-of-the-box thinking that has helped put the brakes on our economic freefall."

VOA: special.2009.08.28

My system is whatever's inside the box.

先定义一下基本概念。

麻省理工公开课 - 热力学与动力学课程节选