Aerial photo taken on Jan. 18, 2019 shows the snow cover in Zhaosu County, northwest China's Xinjiang Uygur Autonomous Region. A nine-member research team with an average age under 30 from the Xinjiang Institute of Ecology and Geography under the Chinese Academy of Sciences has carried out a research on snow cover on the Tianshan Mountains in Xinjiang. (Xinhua/Hu Huhu)?