负压疗法降低了频繁给伤口换绷带的需要，从之前每天换1到3次降低到几天才换一次；在医护人员紧缺的时候，这会起到很大的作用。

Negative-pressure therapy decreases the need to change wound dressings from one to three times per day to once every few days, a major benefit when medical staff is in short supply.

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它的主要换热作用由布置在转子中的受热面来完成。

Its main heat exchange function is realized by heating surface arranged in rotors.

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如果你选取了一些从未听过你们歌曲的朋友，那么它会起到很大的作用，这样，你可以让他们听这首歌直到听腻为止，再换第二首。

This works best if you can rustle up a few friends who haven't heard the songs.

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So you know, what the second law is doing, in other words, it's putting these restrictions on how well or how effectively we can convert heat into work in the case of the engine, or work into heat extracted in the case of a refrigerator.

你们知道，在热机中，热力学第二定律的作用，换句话说，就是给热量,转化为功的效率,施加限制,或在制冷剂中，对抽取热量,进行限制。

麻省理工公开课 - 热力学与动力学课程节选