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Participants walk on the ice-covered trekking route during an ice trekking event in Panjin of northeast China's Liaoning Province, on Jan. 13, 2017. (Xinhua/Pan Yulong)
Participants walk on the ice-covered trekking route during an ice trekking event in Panjin of northeast China's Liaoning Province, on Jan. 13, 2017. (Xinhua/Pan Yulong)