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。
2
Spills would also be a health risk, since carbon dioxide is heavier than air, and so can build up in low-lying or poorly ventilated spots.
二氧化碳泄漏会带来健康风险。 由于二氧化碳比空气重，因此可以在低洼地区和通风差的地区累积。
3
The air wands can apply cool air directly to the “hot spots” inside a server tray, meaning less air is wasted or misdirected in the server room or container.