That's because magnetic fields reduce the pressure exerted on the gases inside of them, making the spots cooler than the rest of the Sun's surface.

这是因为磁场降低了施加在内部气体上的压力，使得太阳黑子比太阳表面的其他部分温度更低。

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And water vapor pressure is lower when the air is cooler, meaning sweat evaporates faster.

凉快时水蒸发压低，这意味着汗水能很快蒸发。

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In a cooler world, this sort of high pressure over Russia would be less likely to result in such a dramatic heatwave; nor, probably, would the floods in Pakistan have been so bad.

在更冷的世界里，俄罗斯上空的这种高气压压本不可能导致如此剧烈的热浪；而且巴基斯坦的洪灾情况也本不可能如此严峻。

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Or in many kinds of gas refrigerators where you push a gas through a nozzle close to room temperature, what you find is that the gas coming out on the other side under lower pressure is cooler than the gas that went through on the other side.

或者在很多种压缩气体式冰箱中,你让气体通过接近室温的管口,你会发现从压力低的一边,出来的气体比通过,另一边的气体更冷,真正的冰箱实际上通过。

麻省理工公开课 - 热力学与动力学课程节选