【简介】感谢网友“雕龙文库”参与投稿，这里小编给大家分享一些，方便大家学习。
从昨天下午开始，浓重的雾霾又开始笼罩京城。不久前中科院出了一个研究结果，称汽车尾气及垃圾焚烧仅占PM2.5
Although scientists have not agreed on an exact percentage of vehicle exhausts' contribution to fine particulate matters in big cities, they do agree it is a major source of pollution.
尽管科学家们对于汽车尾气在大城市PM2.5 汽车尾气的英文表达是vehicle/automobile exhausts，它和soil dust 目前为了减少汽车尾气，各大城市都开始实行restrictions on purchasing motor vehicles
