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Black swans are seen at the Nanning Garden Expo Park in Nanning, south China's Guangxi Zhuang Autonomous Region, April 9, 2020. (Xinhua/Cui Bowen)
Black swans are seen at the Nanning Garden Expo Park in Nanning, south China's Guangxi Zhuang Autonomous Region, April 9, 2020. (Xinhua/Cui Bowen)