The roses perfume the air in summer and perish in winter.

玫瑰在夏天使空气芳香，在冬天里凋谢。

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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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The rain washes away the signs of summer and brings in nice and cool air.

雨洗去了夏天旳痕迹，带来了清新而清爽的空气。

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You are up high, so even in the summer the air usually is cool.

VOA: special.2009.07.20

Visitors to Washington,D.C., in the summer often want to stay inside air-conditioned museums.

VOA: special.2009.09.21

he observes,pointing to the very substantial cuts in air pollution emissions during the 2008 summer Olympics in the Beijing metropolitan area.

VOA: standard.2010.04.07

Buildings are routinely over-air conditioned in the summer, lights are left on at night, computers hum all weekend long.

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If humans are still around when and if it happens it is quite likely we would survive these massive changes with air conditioning in the summer and a lot of heating in winter.

BBC: Why the Moon is getting further away from Earth

The theory behind outdoor napping is that children exposed to fresh air, whether in summer or the depths of winter, are less likely to catch coughs and colds - and that spending a whole day in one room with 30 other children does them no good at all.

BBC: The babies who nap in sub-zero temperatures