Staff members check a helicopter on China's research icebreaker Xuelong, also known as the Snow Dragon, on Nov. 21, 2018. The icebreaker is on China's 35th Antarctic research expedition. At 6:22 p.m. Wednesday (local time), Xuelong crossed the stormy westerlies on its way toward China's Zhongshan Station in Antarctic. (Xinhua/Liu Shiping)