It removes heat from the air outside or the ground below and uses it to supply heat to a building or its water supply.

它从外面的空气或下方的地面收集热量，并用此来供应建筑物或其供水所需的热量。

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The system also cools the air around the water, creating a bigger temperature difference so it can absorb more heat from the outside air.

这个系统同样也给水周围的空气降温，产生出更高的温度差，这样它就能从外部空气中吸收更多的热量。

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"When the weather was good, they'd bring the paintings, calligraphy and books outside to give them some fresh air because it was too humid inside," he said.

“好天气时，他们就将绘画、书法和书籍带到外面来通风，因为里面太潮湿了”，他说。

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He got up in the morning and he had his breakfast and he went outside and he's laying down in his air-conditioned grotto outside taking it very easy, completely unaware of the hard work that Mei Xiang has done all night.

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"By that I mean try to imagine creating a cavity inside your mouth without any air bubbles and by letting in no air through your lips or throat -- it's basically impossible at sea level because the air pressure outside your mouth pushes the air pocket closed, " he said.

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The main objection to the EU's policy is that it applies to air-miles clocked up outside European airspace.

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