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Niklas Mattsson of Sweden competes during the men's slopestyle final at FIS Snowboard World Cup in Chongli of Zhangjiakou City, north China's Hebei Province, Dec. 21, 2018. (Xinhua/Yang Shiyao)

Niklas Mattsson of Sweden competes during the men's slopestyle final at FIS Snowboard World Cup in Chongli of Zhangjiakou City, north China's Hebei Province, Dec. 21, 2018. (Xinhua/Yang Shiyao)