This soldier shows an electrical system he says is used to circulate air underground.

这名士兵展示了他说是用于在地下循环空气的电气系统。

Yeah. So the fan is basically gonna spray and circulate that hot air.

是的。所以风扇基本上会喷射和循环热空气。

These are porous molecular networks through which air can circulate. Their porosity gives them a huge surface area.

这些是多孔的分子网络，空气可以通过它们循环。它们的多孔性使它们具有很大的表面积。

That's because the particles that carry the virus get diffused by circulating air, when people are gathered indoors in tight spaces without good ventilation that increases the likelihood of spread.

这是因为携带病毒的颗粒通过空气循环扩散，当人们聚集在室内狭小空间，没有良好的通风条件时，就增加了传播的可能性。

Without ocean currents circulating warm and cool air across the planet, you'd have a lot more extreme differences in temperature and climate.

如果没有洋流在地球上循环暖空气和冷空气，就会出现更加极端的温度和气候差异。

UNIDENTIFIED FEMALE: When people, if they get in coughing I roll the windows down in the back a little bit and kind of you know circulate the air around the car.

当人们咳嗽着上车时，我会将后车窗摇下来一点，使汽车周围的空气流通起来。

It also has a fan at the top so that'll circulate the air around and it's got a little heating element in the wood chamber. Simplest terms, it is a smoky oven.

它的顶部还有风扇，这样空气就可以循环，木头室里有一个小加热元件。最简单的说法就是烟熏炉。

The casement windows allow warm air to be  funnelled from down below up into the high level rooms and out through the courtyard space  this allows the lower rooms to be cool through a Venturi effect of circulating hot air.

平开窗使暖空气从下向上流入高层房间，并通过庭院空间流出，这使得较低的房间可以通过循环热空气的文丘里效应来冷却。