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Photo taken on April 2, 2019 shows migratory swans swimming in the Baishi Reservoir in Beipiao City of northeast China's Liaoning Province. (Xinhua/Pan Yulong)
Photo taken on April 2, 2019 shows migratory swans swimming in the Baishi Reservoir in Beipiao City of northeast China's Liaoning Province. (Xinhua/Pan Yulong)