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China's first domestically built polar icebreaker Xuelong 2, or Snow Dragon 2, leaves Cape Town of South Africa on Jan. 23, 2020. (Xinhua/Liu Shiping)

China's first domestically built polar icebreaker Xuelong 2, or Snow Dragon 2, leaves Cape Town of South Africa on Jan. 23, 2020. (Xinhua/Liu Shiping)