No two of them ever pulled at the same time in the same direction.

VOA: special.2009.11.26

The second law is going to define entropy, and is going to tell us about the direction of time, something that conceptually we, clearly, understand but is going to put a mathematical foundation on which way does time go.

第二定律定义了熵，它告诉我们,时间的流向，虽然我们清楚地,知道这个概念,但还是要为时间流动的方向,建立一个数学基础。

麻省理工公开课 - 热力学与动力学课程节选

p2 p1 is greater than p2. Then I want to reverse direction of time. I want the arrow of time to go so that the gas goes from p2 to p1.

一直推，一直推，p1大于,接下来我想让时间倒流,让气体从p2到p1。p2比p1小。

麻省理工公开课 - 热力学与动力学课程节选

Congresswoman Lee says the delegation's conclusion is that, given the new direction of American foreign policy under the Obama Administration, it is time to move in a different direction.

VOA: standard.2009.04.07