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Kristina Spiridonova of Russia competes during the mixed team preliminary at the Freestyle Skiing Aerials World Cup in Zhangjiakou, north China's Hebei Province, Dec. 17, 2017. (Xinhua/Fei Maohua)

Kristina Spiridonova of Russia competes during the mixed team preliminary at the Freestyle Skiing Aerials World Cup in Zhangjiakou, north China's Hebei Province, Dec. 17, 2017. (Xinhua/Fei Maohua)