She gave a free concert in the open air, near the Lincoln memorial.

VOA: special.2009.01.25

It's going to take place in there. It's going to be a constant pressure, it might be open to the air, or even if it isn't, there might be plenty of room, and it's a liquid anyway, so the pressure isn't going to change significantly.

也许它是液体，它在这个位置,这是恒压的，它也许是连通大气的，就算不是，它也有，足够的空间，而它是液体,压强不会显著地改变。

麻省理工公开课 - 热力学与动力学课程节选

The World War Two Memorial stands in the open air.

VOA: special.2009.05.25

Because of the open-air stage, actors had to shout very loudly and make big motions to be heard and seen by all.

VOA: special.2010.01.06

Inside the car, they should open a window a little for fresh air and turn on the engine for ten or fifteen minutes every hour for heat.

VOA: special.2010.01.05

The seeds float in the air when the pods break open.

VOA: special.2010.04.06

Across the street, the parking lot of Haiti's elite police emergency response unit has become an open-air medical clinic.

VOA: standard.2010.01.26