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China's polar icebreaker Xuelong 2, or Snow Dragon 2, sails across westerlies on Jan. 15, 2020. Xuelong 2 passed through the westerlies Wednesday night local time. (Xinhua/Liu Shiping)

China's polar icebreaker Xuelong 2, or Snow Dragon 2, sails across westerlies on Jan. 15, 2020. Xuelong 2 passed through the westerlies Wednesday night local time. (Xinhua/Liu Shiping)