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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We wanted to reduce the cost of heating and air-conditioning.

我们想减少供暖与空调的开支。

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The class experiment that day was to show how heating a container of water would bring air bubbling to the surface.

那天的课堂实验是为了展示加热一个盛水的容器会如何让空气冒泡到表面。

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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.

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

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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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