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China's top track and field star, Liu Xiang,  (office) announced his retirement on Tuesday through his Weibo account    being sidelined for more than two years in rehabilitation修复of an ankle surgery. The 31-year-old athlete star chose a low-key way to announce his retirement. "From today on, I will say goodbye to my   (profession)   athletics career. It's a decision     (make) through thorough consideration. I have no other    (choose) despite reluctance and pain. Goodbye, my track, my hurdles!"  Rumors of Liu's retirement  (report) periodically定期的 since he fell down at 2012 London Olympic Games 110-meter hurdles' preliminary contest,    was the last match he ever attended. In Athens, Liu tied the 12.91 seconds world record to claim the gold medal .His breakthrough of winning the Olympics and world championships proved   Asian people can be competitive  Western counterparts in men's sprint冲刺 events at the highest level. That's   huge motivator激励 that should be reckoned考虑 with.