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Mute swans fly in the sky over the Ulansuhai Nur in Bayannur, north China's Inner Mongolia Autonomous Region, Oct. 25, 2019. (Xinhua/Liu Lei)
Mute swans fly in the sky over the Ulansuhai Nur in Bayannur, north China's Inner Mongolia Autonomous Region, Oct. 25, 2019. (Xinhua/Liu Lei)