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Workers help China's first domestically built polar icebreaker "Xuelong 2," or "Snow Dragon 2", berth at its home port in Shanghai, east China, July 23, 2019. (Xinhua/Zhang Jiansong)

Workers help China's first domestically built polar icebreaker "Xuelong 2," or "Snow Dragon 2", berth at its home port in Shanghai, east China, July 23, 2019. (Xinhua/Zhang Jiansong)