Theearthisourhome;wemusttakeCareofit.Thismeanskeepingth...
問題詳情:Theearthisourhome;wemusttakeCareofit.Thismeanskeepingtheland,airandwaterclean. Pollutionisadirtyword.Topollutemeanstomakethingsunfit(不合適的)oruncleantouse.Pollutioncomesinmanyways.Weseei...