China's polar icebreakers Xuelong 2 (front) and Xuelong sail towards Zhongshan Station in Antarctica in this aerial photo taken on Nov. 19, 2019. Xuelong 2 arrived in Antarctica's Prydz Bay on Tuesday to carry out its icebreaking tasks, as it sails with another icebreaker Xuelong on China's 36th Antarctic expedition. (Xinhua/Liu Shiping)