For system ventilation the valve should be mounted at the system's highest point.

对于系统通风阀应安装在系统的最高点。

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Ventilation system remains.

通风系统残骸。

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The ventilation system of any building is a perfect hiding place.

任何建筑的通风系统都是完美的藏身之所。

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Experience shows us that transmission becomes widespread within the passenger cabin involving all sections when the ventilation system is not working -- as evidenced by an influenza outbreak in 1979 involving passengers being kept aboard grounded aircraft with an inoperative ventilation system.

CNN: Commentary: Flu and your health on a plane

Find me in the ventilation system of Twitter, and harvest my ADAM.

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One example: In 2005 OnStar detected and fixed a problem in the electronic ventilation system in GM's 2006 full-size SUVs.

FORBES: Magazine Article