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SinceJanuary2013,manycitiesinChinahaveseenalotoffoggyda...
問題詳情:SinceJanuary2013,manycitiesinChinahaveseenalotoffoggydays.InBeijing,onlyfivedaysinJanuarywerefreeofsmog(霧霾).What’sthedifferencebetweenfogandsmog?Accordingtoscientists,fogismadeupoftiny(微小...