霧霾的危害英語作文：Air Pollutant
關于霧霾的英語作文

        This kind of air pollutant come from a variety of natural and manmade sources. Natural sources can include windblown dust, and soot from wildfires. Manmade sources can include motor vehicles, and industrial fuel burning, and manufacturing operations. The one of the main cause that touches off haze is manufacturing operations. Many factories were over measure produced the smog that had over    （共 629 字）     [閱讀本文] >>