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China's polar icebreaker Xuelong 2, or Snow Dragon 2, sails in the misty Southern Ocean on Jan. 30, 2020. Xuelong 2 crossed the prime meridian and entered the Western Hemisphere on Thursday. (Xinhua/Liu Shiping)
China's polar icebreaker Xuelong 2, or Snow Dragon 2, sails in the misty Southern Ocean on Jan. 30, 2020. Xuelong 2 crossed the prime meridian and entered the Western Hemisphere on Thursday. (Xinhua/Liu Shiping)