People visit a photo exhibition on biodiversity of the Nujiang River in southwest China's Yunnan Province, in Beijing, capital of China, Sept. 4, 2016. The four-day exhibition was opened at the Beijing Zoo on Sunday. (Xinhua/Tao Xiyi)
People visit a photo exhibition on biodiversity of the Nujiang River in southwest China's Yunnan Province, in Beijing, capital of China, Sept. 4, 2016. The four-day exhibition was opened at the Beijing Zoo on Sunday. (Xinhua/Tao Xiyi)
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