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Photo taken on Dec. 6, 2019 shows black swan birdlings raised at an agricultural cooperative in Guangshan County of Xinyang, central China's Henan Province. (Xinhua/Lu Peng)
Photo taken on Dec. 6, 2019 shows black swan birdlings raised at an agricultural cooperative in Guangshan County of Xinyang, central China's Henan Province. (Xinhua/Lu Peng)