Don't rely on an air conditioner, ventilation system or an open window to clear the air.

不要依赖空调，排气系统或打开窗户来清洁空气。

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The Diamond DA42M Guardian is being kitted out with a special air sampling system to help accurately map the cloud that is causing chaos to air travel across Europe.

《钻石DA42M护卫者号》飞机装备着特殊的空气采样系统，它的上任有助于精确绘制出欧洲上空的火山灰云层图，目前整个欧洲航空业由于冰岛的火山爆发已经陷入一片混乱。

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The US air Force purchased its first MERLIN bird radar system in 2003 and has installed six systems at US air bases and ranges to date.

美空军在2003年购买了第一套MERLIN鸟击雷达系统，并安装了在美国6个空军基地。

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Engineers on the ground designed a way the astronauts could connect air-cleaning devices from the command module to the air system in the lunar module.

VOA: special.2009.07.22

The FAA says funding for the new fee system, combined with federal money, would shift the 40-year-old ground-based air traffic control system to a satellite-based, cockpit-to-cockpit system that is safer and more efficient.

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As a benign example of how transatlantic teams can stimulate competition in high-tech weapons making, defence analysts cite the fierce competition to supply Britain with an air-to-ground surveillance system.

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The American Jobs Act includes an immediate investment in employing construction workers to restore 150 miles of runway at American airports and put in place a next-generation air-traffic control system to reduce travel time and delays.

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