A snowmobile passes by an iceberg as it transports supplies to the Zhongshan Station in Antarctica, November 24, 2019.(Photo/Xinhua)

A snowmobile passes by an iceberg as it transports supplies to the Zhongshan Station in Antarctica, November 24, 2019.(Photo/Xinhua)

A helicopter unloads cargo from China's polar icebreaker Xuelong in Antarctica on December 1, 2019. China's polar icebreakers Xuelong and Xuelong 2 on November 27, 2019 reached the waters near the Zhongshan Station in Antarctica. (Photo/Xinhua)

The helicopter unloads cargos from China's polar icebreaker Xuelong in the waters in Antarctica, Nov. 23, 2019.(Photo/Xinhua)

The photo taken on December 1, 2019 shows China's polar icebreakers Xuelong and Xuelong 2 reached the waters near the Zhongshan Station in Antarctica. (Photo/Xinhua)