Theairpollutionwasso的精選

問題詳情：TheairpollutionwassobadinHarbin,inChina,onOctober21,2013thatthecityhadtocloseroadsandschools,andcancel hundredsofflightsfromitsairport.Newsreportssaidthesmog(amixtureofsmokeandfog)wassothickt...