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
Visitors view black-headed gulls by the bank of Dianchi Lake in Kunming, southwest China's Yunnan Province, Nov. 16, 2019. (Xinhua/Li Mangmang)
Visitors view black-headed gulls by the bank of Dianchi Lake in Kunming, southwest China's Yunnan Province, Nov. 16, 2019. (Xinhua/Li Mangmang)