China‘sstarhurdlerLiuXianghaspulledoutthe2012LondonDiamondLeaguemeetingaftersufferingfromabadback.中國跨欄之星劉翔因背部傷勢退出2012倫敦鑽石聯賽。Liuhadcruisedintothe110meterhurdlesfinalatCrystalPala......