World Air Group, as a transnational nature of the shipping service organizations, networks in the U. S. , Italy, China, Belgium, Germany, Croatia, Africa, Russia, Brazil, Cuba, Japan, Singapore and other places.
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Pigeons and pollution are both common blights in cities around the world, but a group of engineers in London are hoping the birds can help them tackle problems with air quality.
对世界上许多城市来说，鸽子和污染问题都是常见的危害，但伦敦的一群工程师却希望能利用鸽子来帮助解决空气污染问题。
During the Second World War, when a young group of pilots in the RAF were fighting for their lives in the air over England, they would often be hit by enemy fire.
在第二次世界大战中，当英国皇家空军在英格兰上空为自己的生命二战的时候，他们经常会被敌军的火力攻击到。
A working group of the World Health Organisation has proposed a set of draft new WHO air quality guidelines.
世界衞生组织的工作小组建议了一套新空气质素指引。
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