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A flock of sea gulls fly at Baxianguohai scenic area in Penglai City, east China's Shandong Province, Dec. 17, 2017. (Xinhua/Yu Liangyi)
A flock of sea gulls fly at Baxianguohai scenic area in Penglai City, east China's Shandong Province, Dec. 17, 2017. (Xinhua/Yu Liangyi)