First, check the output of du on both the old and the new system (see Listing 13).

首先，检查du对旧的和新的系统的输出(请参见清单13)。

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And so, we can immediately write this du and then we can write du for the universe, which is system plus surroundings is equal to zero.

因此，我们可以立刻写出这个等式，然后可以写出总的的，也就是系统加环境的du，等于零。

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Using some theory and method of the operational research, this article shows the evaluating and administering models of the Karst water resources system in the southern part of Du-shan, Guizhou.

本文运用运筹学中的有关理论和方法，给出了贵州独山南部岩溶水资源系统的评价模型和管理模型。

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du We can talk about du for the system well, w that's q plus w.

我们可以讨论它的，等于q加。

麻省理工公开课 - 热力学与动力学课程节选

And so, we can immediately write this du and then we can write du for the universe, which is system plus surroundings is equal to zero.

因此，我们可以立刻写出这个等式,然后可以写出总的的，也就是系统加环境的du，等于零。

麻省理工公开课 - 热力学与动力学课程节选