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Giant panda Tian Tian celebrates 20th birthday in U.S.
Giant panda Tian Tian enjoys birthday cake during a celebration for its 20th birthday at Smithsonian's National Zoo in Washington D.C., the , Aug. 27, 2017. The zoo held a celebration on Sunday for giant panda Tian Tian's 20th birthday. (Xinhua/Yin Bogu)
