Photo taken on April 10, 2020 shows the scenery of a glacier in Subei Mongolian Autonomous County, northwest China's Gansu Province. (Photo by Du Zheyu/Xinhua)

Photo taken on April 10, 2020 shows the scenery of a glacier in Subei Mongolian Autonomous County, northwest China's Gansu Province. (Photo by Du Zheyu/Xinhua)

Aerial photo taken on April 10, 2020 shows the scenery of a glacier in Subei Mongolian Autonomous County, northwest China's Gansu Province. (Photo by Du Zheyu/Xinhua)

Photo taken on April 10, 2020 shows the scenery of a glacier in Subei Mongolian Autonomous County, northwest China's Gansu Province. (Photo by Du Zheyu/Xinhua)

Photo taken on April 10, 2020 shows the scenery of a glacier in Subei Mongolian Autonomous County, northwest China's Gansu Province. (Photo by Du Zheyu/Xinhua)

Photo taken on April 10, 2020 shows the scenery of a glacier in Subei Mongolian Autonomous County, northwest China's Gansu Province. (Photo by Du Zheyu/Xinhua)

Aerial photo taken on April 10, 2020 shows the scenery of a glacier in Subei Mongolian Autonomous County, northwest China's Gansu Province. (Photo by Du Zheyu/Xinhua)