CHINESE 110-meter hurdler Liu Xiang tied (与……成平局) the world record of 12.87 seconds at the Prefontaine Classic Diamond League on June 3 in Eugene, US. Although the result turned out to be wind-aided and cannot be accepted (接受) officially, the 28-year-old is more than happy to say that he has returned to his peak. “I’m happy with my results. Actually, I’m strong in all areas, but I still need to concentrate (集中) on every competition,” Liu said after the competition.