XINHUA PHOTOS OF THE DAY Aerial photo taken on Jan. 7, 2019 shows a group of nine herders equipped with the ancient fur skis on the challenging trip of crossing the Altai Mountains in China's Xinjiang Uygur Autonomous Region with a total journey of more than 300 kilometers. The history of their skis can be traced back to 12,000 years ago. (Xinhua/Hu Huhu)