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Members of China's 36th Antarctic expedition team collect conductivity, temperature and depth (CTD) data on China's polar icebreaker Xuelong 2 in the Cosmonauts Sea, Dec. 16, 2019. (Xinhua/Liu Shiping)

Members of China's 36th Antarctic expedition team collect conductivity, temperature and depth (CTD) data on China's polar icebreaker Xuelong 2 in the Cosmonauts Sea, Dec. 16, 2019. (Xinhua/Liu Shiping)