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China's polar icebreakers Xuelong 2 (front) and Xuelong sail towards Zhongshan Station in Antarctica in this aerial photo taken on Nov. 19, 2019. (Xinhua/Liu Shiping)

China's polar icebreakers Xuelong 2 (front) and Xuelong sail towards Zhongshan Station in Antarctica in this aerial photo taken on Nov. 19, 2019. (Xinhua/Liu Shiping)