When driving in a car on a hot summer day, you may see what looks like shimmering water on the road, which, as science tells us, is really just a mirage, an illusion caused by the heating of the air.

在炎热的夏天开车时，你可能会在路上看到闪闪发光的水，但科学告诉我们，这其实只是海市蜃楼，是空气加热造成的幻觉。

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More than three billion people are at risk from indoor air pollution because of the heating or cooking fuels they use.

VOA: special.2010.02.01

These will include more modern air cooling and heating systems.

VOA: special.2009.05.22

He had also applied to a six-month training program for heating and air-conditioning technicians.

NEWYORKER: Hellhole

This week the commercial heating and air conditioning manufacturer Trane, based in Piscataway, N.

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Gyms have huge treadmills, flat screens, heating and air conditioning, and often require lots of energy.

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