如果我们不加压空气进这些航空公司的客舱，乘客就会窒息。
If we didn't pressurize airline cabins by pumping air into them, passengers would suffocate.
据NASA解释，飞机在超音速飞行时会产生延伸到地面的加压空气分子锥。
Airplanes flying faster than sound create a cone of pressurized air molecules that extends to the ground, as NASA explains.
系统根据您中央加压空气系统的地点安装在阁楼，地下室或者车库，从外面不会看出。
The system is out of view in your attic, basement, or garage, depending on where your central forced air system is located.
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