Aerial photo taken on Nov. 20, 2019 shows China's polar icebreaker Xuelong 2 (front) breaking ice near the coast of Antarctica. China's polar icebreakers Xuelong and Xuelong 2 on Wednesday reached the waters near the Zhongshan Station in Antarctica. (Xinhua/Liu Shiping)

Aerial photo taken on Nov. 20, 2019 shows China's polar icebreaker Xuelong 2 (L) breaking ice for another icebreaker, Xuelong, which is trapped in ice near the coast of Antarctica. China's polar icebreakers Xuelong and Xuelong 2 on Wednesday reached the waters near the Zhongshan Station in Antarctica. (Xinhua/Liu Shiping)

Aerial photo taken on Nov. 20, 2019 shows China's polar icebreakers Xuelong 2 (R) and Xuelong sailing towards the Zhongshan Station in Antarctica. China's polar icebreakers Xuelong and Xuelong 2 on Wednesday reached the waters near the Zhongshan Station in Antarctica. (Xinhua/Liu Shiping)

Aerial photo taken on Nov. 20, 2019 shows China's polar icebreaker Xuelong 2 (front) breaking ice near the coast of Antarctica. China's polar icebreakers Xuelong and Xuelong 2 on Wednesday reached the waters near the Zhongshan Station in Antarctica. (Xinhua/Liu Shiping)