This is because most fraternities and sororities are named after a series of Greek letters, such as Alpha Delta Pi or Sigma Phi.

VOA: special.2009.09.25

So, I just want to write a few examples down with a few values for delta u or delta H or delta S, and see whether we can get any clues from what we see.

我先写一些例子,例子包含一些内能，自由焓和熵的变化数值，然后看从中,我们能不能得到一些启示。

麻省理工公开课 - 热力学与动力学课程节选

So here are results for pathway A, right, for delta u zero delta H zero. I didn't actually explicitly write it or did I?

这是路径A的结果，△U是零,△H是零，我没有明确地写出来,是吧？让我们把它再写一遍？

麻省理工公开课 - 热力学与动力学课程节选

We are going to take the sum of the delta H's delta H or the deltas H for all of these little reactions.

我们将会把这些H加和,也就是所有这些过程的。

麻省理工公开课 - 固态化学导论课程节选

And what we say when we talk about the delta energy is I E 2 that this is going to be equal to i e 2, or the second ionization energy, or we could say the negative of the binding energy of a 2 s electron in b plus.

那么我们说,Δ，E，应该等于，或者说第二电离能，也就是正一价硼中，2，s，电子的,束缚能的负值。

麻省理工公开课 - 化学原理课程节选

There is one exception. In the sixth century, I think it's around--imagine around 550 or something like that, the Greeks settle a single colony in the Delta of the Nile of Egypt at a place called Naucratis, and the root of that word is ship.

但有一个例外,在公元前六世纪,我想大概是,在公元前550年左右,希腊在埃及尼罗河三角洲,一个叫诺克拉提斯的地方建立了殖民地,Naucratis的意思就是船

耶鲁公开课 - 古希腊历史简介课程节选

One thing that makes it pretty clear is that certainly delta S or the sign of it alone is not dictating the outcome here.

这个例子非常清楚的说明,熵增dS或者它的符号,不能单独决定最后的结果。

麻省理工公开课 - 热力学与动力学课程节选

Of course, they're all sorts of conditions under which a reaction could be wrong in the lab or outdoors or however, right. But this is the way we're going to define delta H of reaction.

当然，在实验室或室外,之类的环境中，在这些条件下,反应可能出错，但这是我们,要定义反应的△H的方法。

麻省理工公开课 - 热力学与动力学课程节选