笔者以本厂的醇酸树脂生产为例，介绍了热媒加热循环系统和冷媒冷却系统。

A typical heat medium heating system and cold medium cooling system were given.

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曲轴齿箱中的真空循环与加热循环之间存在的巨大交互感应(做还是不做加热循环？)

A strong interaction exists between the vacuum cycle and the heating cycle on the crank gear box (do or not do the heating cycle?)

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简要分析覆铜板芯布立式干燥系统组成和原理、辐射板干燥及其气流加热循环、气帘冷却循环等技术。

A brief analysis is given of the vertical radiant curing oven drying system with oil-heated air circulation and water-cooled air curtain used for manufacturing impregnated glassfibre fabrics.

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It expands. You change your constraints on your system, you heat it up some more, then you take the heat source away, and you put it back in contact with the atmosphere. And you cool it a little bit, change the constraints, cool it a little bit more, and heat, and you've got a closed cycle engine.

让它与大气接触冷却,改变约束，使它继续冷却，然后又再次加热,这就是循环热机，我们以前也研究过，更复杂的机器。

麻省理工公开课 - 热力学与动力学课程节选