Along the southern margin of the heat wave, the tropical air collided with cooler air.

沿着热浪南部边缘，热空气与冷空气对撞。

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Warm air is less dense than cooler air so it ends up layered on top of the downward moving cooler air.

热空气比冷空气密度小，因此热空气总在冷空气上方。

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The chip could also use thermoelectric materials, which produce an electric current when exposed to two different temperatures-such as body heat and the (usually) cooler air around us.

芯片也可以使用温差热电材料- - -这种材料因环境中两种不同温度而产生电流- - -例如身体温度和(通常是)我们周围的更凉的空气。

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The inside of the box will stay several degrees cooler than the outside air temperature.

VOA: special.2009.11.30

As we climbed the air grew cooler and the Indian girls on the road wore shawls over their heads and shoulders.

在我们开车向山上爬行的过程中，空气开始,变得凉爽起来，路上的印第安姑娘都披着围巾。

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(VOICE) She recited a long list of relatives who have left Moscow in recent days, hoping to find cleaner air and cooler temperatures.

VOA: standard.2010.08.10

The thunderstorm developed in an area where warm moist air rose into cooler air.

NPR: Oklahoma Twister Tracked Path Of 1999 Tornado

The cooler air at the top will contract and become more dense and create a downdraft.

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In a warm front, a mass of relatively warm air pushes against a block of cooler air and is forced to flow up over it.

BBC: Turbulence ahead: Flight heads into storm's heart