BEIJING, April 17, 2016 (Xinhua) -- Photo taken with a mobile phone shows a breeder helping giant pandas "Yang Yang" and "Su Shan" try natural mating at the Bifengxia base of the China Conservation and Research Center for the Giant Pandas in Ya'an City, southwest China's Sichuan Province, April 14, 2016. (Xinhua/Xue Yubin)
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