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Tourists take photos in front of icicles at Dadunxia scenic spot in Linxia Hui Autonomous Prefecture, northwest China's Gansu Province, Dec. 16, 2018. (Xinhua/Shi Youdong)

Tourists take photos in front of icicles at Dadunxia scenic spot in Linxia Hui Autonomous Prefecture, northwest China's Gansu Province, Dec. 16, 2018. (Xinhua/Shi Youdong)