It prevents the polluted cooler air from rising.
上层暖空气使得污染的冷空气无法上升。
As the warm air rises, cooler air takes its place.
热空气上升时，冷空气便占据它的位置。
Please remember there is cleaner, cooler air near the floor during the fire.
请记得有清洁、凉爽的空气在大火中，在地板上的。
At night the cooler air from the mountains sinks through the open roof lights.
晚上从山上冷空气下沉，通过公开屋顶灯。
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。
There, cooler air condenses the refrigerant and becomes heated during the process.
在那里，较冷的空气使冷冻剂冷凝，并在此过程中变热。
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。
As the hot beach air rises up, the relatively cooler air over the water moves in to take its place.
随着海滩上空热空气的上升，水面上相对寒冷的空气就会流动过来代替热空气的位置。
To cool these components, fans are used to move dead air away from the components and draw cooler air over them.
这些元件降温，粉丝是用来移动空调远离死亡的组成部分和借鉴他们的冷空气。
This is covered by an upper layer of warm air that ACTS like a lid. It prevents the polluted cooler air from rising.
这层冷空气就阻挡了这些被污染的冷空气，使之不能上升的高空中。
But according to the theory, yawning cools the brain via a heat exchange with cooler air drawn in during the process.
但从理论上来讲，只有通过与吸入的冷空气进行热量交换，打哈欠才能为大脑降温。
Cold air intake and how it works. A cold air intake is used to bring cooler air into a car's engine, to increase engine power and efficiency.
一个寒冷的进气是用来把冷空气进一辆油罐车的引擎，对提高发动机功率和效率。
Because cooler air has a higher density (greater mass per unit volume), cold air intakes generally work by introducing cooler air from outside the hot engine bay.
因为冷气流密度较高(更大的质量单位体积内)，冷空气引入采一般的工作从外面冷空气热引擎湾。
You may think people would tend to cool the brain by yawning more in summer. But according to the theory, yawning cools the brain via a heat exchange with cooler air.
也 许人们会认为，人在夏天时更倾向于给脑子降温，但是，根据该理论，打哈欠得通过和较冷 的空气进行热传导才能降低人脑温度。
Well-designed intakes use heat shields to isolate the air filter from the rest of the engine compartment, providing cooler air from the front or side of the engine bay.
使用设计良好的摄入热量盾牌隔离空气滤清器的其他发动机舱，提供冷空气从前面或侧面的发动机湾。
Air heated by the arc moves upward because it is less dense than the cooler air around it, and it moves at a speed for which the buoyant force and the drag force are equal.
空气加热，电弧向上的动作，因为它是密度较低，较凉的空气靠近它，它的速度移动，其中有浮力和阻力都是平等的。
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。
In the troposphere, the air at higher altitudes is in general cooler than the air below it.
在对流层中，高海拔地区的空气通常比低海拔地区的空气冷。
As they climbed higher, the air became cooler.
他们攀登得越高，空气就变得越凉爽。
It was cooler here, and there was dampness in the air.
以前这儿更凉爽，而且空气中有潮气。
As we climbed up the hill, the air grew cooler and the Indian girls on the road wore shawls over their heads and shoulders.
在我们向山上爬行的过程中，空气变得凉爽起来，路上的印第安姑娘都披着披肩。
Since cold air sinks, and these spots are shaded, they are usually much cooler than the surrounding area.
由于冷空气下沉，这些斑点被遮蔽，它们通常比周围的地区要冷得多。
In the evening, open windows and use fans to create a cross-breeze, circulating cooler evening/night air through the rooms.
在晚上，打开窗户或者用风扇让空气保持对流，让凉快的晚风能够穿过房子。
If air in the atmosphere is cooler than brain and body temperatures, taking it in quickly cools facial blood that, in turn, cools the brain and may even alter blood flow.
如果环境空气的温度比大脑和身体的温度低，把它快速吸入可以冷却面部血液，当然，也为大脑甚至血液循环降了温。
Your refrigerator has to be cooler than the air around it.
你的冰箱已经是比它周围的空气冷却器。
And water vapor pressure is lower when the air is cooler, meaning sweat evaporates faster.
凉快时水蒸发压低，这意味着汗水能很快蒸发。
Autumn is a beautiful time of the year. Its cooler temperatures make it more comfortable to be outdoors, and the fresh air is exhilarating.
秋季是一年之中非常美丽的季节，秋高气爽，心旷神怡，非常适宜户外活动。
Autumn is a beautiful time of the year. Its cooler temperatures make it more comfortable to be outdoors, and the fresh air is exhilarating.
秋季是一年之中非常美丽的季节，秋高气爽，心旷神怡，非常适宜户外活动。
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