Photo take on Dec. 31, 2018 shows ice knolls in Antarctica. China's 35th Antarctic expedition team, expected to arrive at Kunlun Station in five days at about 4,000 meters above the sea level near Dome A, entered into the Antarctic Plateau on Monday. (Xinhua/Liu Shiping)

A tractor of China's 35th Antarctic expedition team runs through ice knolls in Antarctica Dec. 31, 2018. The expedition team, expected to arrive at Kunlun Station in five days at about 4,000 meters above the sea level near Dome A, entered into the Antarctic Plateau on Monday. (Xinhua/Liu Shiping)

A tractor of China's 35th Antarctic expedition team run through ice knolls in Antarctica on Dec. 31, 2018. The expedition team, expected to arrive at Kunlun Station in five days at about 4,000 meters above the sea level near Dome A, entered into the Antarctic Plateau on Monday. (Xinhua/Liu Shiping)

Aerial photo taken on Jan. 1, 2019 shows vehivles of China's 35th Antarctic expedition team at their camp in Antarctica. The expedition team, expected to arrive at Kunlun Station in five days at about 4,000 meters above the sea level near Dome A, entered into the Antarctic Plateau on Monday. (Xinhua/Liu Shiping)

A tractor of China's 35th Antarctic expedition team run through ice knolls in Antarctica on Dec. 31, 2018. The expedition team, expected to arrive at Kunlun Station in five days at about 4,000 meters above the sea level near Dome A, entered into the Antarctic Plateau on Monday. (Xinhua/Liu Shiping)

Photo take on Dec. 31, 2018 shows ice knolls in Antarctica. China's 35th Antarctic expedition team, expected to arrive at Kunlun Station in five days at about 4,000 meters above the sea level near Dome A, entered into the Antarctic Plateau on Monday. (Xinhua/Liu Shiping)

Tractors of China's 35th Antarctic expedition team run through ice knolls in Antarctica on Dec. 31, 2018. The expedition team, expected to arrive at Kunlun Station in five days at about 4,000 meters above the sea level near Dome A, entered into the Antarctic Plateau on Monday. (Xinhua/Liu Shiping)