Since1984,Philadelphiahasbeencleaningupitsact.Onebyone,...
问题详情：Since1984,Philadelphiahasbeencleaningupitsbyone,graffiti（涂鸦）coveredwallsarebeing changedintooutdoorfar,morethan1,800murals（壁画）havebeenadelphianowhasmoremuralsthananyotherAmericancity. ...