"They are going to work together in order to achieve the goals of the world -- that really, when you talk about the G20, you are talking about nineteen countries plus the E.U.

VOA: special.2009.10.02

U OK, so let's look at delta u. Delta u is q plus w.

好的，让我们看看Δ

麻省理工公开课 - 热力学与动力学课程节选

One is, du, u is called the internal energy dw or just the energy, is equal to dq plus dw.

其中一个是：du，u是内能,或能量，等于dq加上。

麻省理工公开课 - 热力学与动力学课程节选

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