Chemical sprays like air fresheners, hair spray,cleaning products and even strong beauty aids can trigger an asthma attack.

VOA: special.2010.09.07

So, if you want to attack urban air quality, this is probably moving in the wrong direction, OK?

所以如果你想攻击都市的空气质量，这可能是一个错误的方向，对吗？

麻省理工公开课 - 固态化学导论课程节选

On May,22 they even launched a ground attack on Kandahar air field, NATO's sprawling military base outside the city.

VOA: standard.2010.05.26

Israel's policy since the Gaza War has been to retaliate for every attack, usually with air strikes on tunnels allegedly used by Hamas to smuggle weapons.

VOA: standard.2010.07.30

Speaking to VOA by telephone, a U.S spokeswoman at Bagram, gave details of the fighting, "Several insurgents were killed in the attack this morning on Bagram Air Base that included small arms fire, mortars,rockets and grenades.

VOA: standard.2010.05.19