Since1984,Philadelphiahasbeencleaningupitsact.Onebyone,...
問題詳情：Since1984,Philadelphiahasbeencleaningupitsbyone,graffiti（塗鴉）coveredwallsarebeing changedintooutdoorfar,morethan1,800murals（壁畫）havebeenadelphianowhasmoremuralsthananyotherAmericancity. ...