Photo taken on Dec. 10, 2020 shows clouds seen from the top of the Guangtou Mountain in Tianquan County, southwest China's Sichuan Province. (Xinhua/Jiang Hongjing)

Aerial photo taken on Dec. 10, 2020 shows clouds in morning light seen from the top of the Guangtou Mountain in Tianquan County, southwest China's Sichuan Province. (Xinhua/Jiang Hongjing)

Aerial photo taken on Dec. 10, 2020 shows clouds seen from the top of the Guangtou Mountain in Tianquan County, southwest China's Sichuan Province. (Xinhua/Jiang Hongjing)

Visitors wait for the sunrise on the top of the Guangtou Mountain in Tianquan County, southwest China's Sichuan Province, Dec. 10, 2020. (Xinhua/Jiang Hongjing)

Photo taken on Dec. 10, 2020 shows clouds seen from the top of the Guangtou Mountain in Tianquan County, southwest China's Sichuan Province. (Xinhua/Jiang Hongjing)

Aerial photo taken on Dec. 10, 2020 shows clouds and mountains seen from the top of the Guangtou Mountain in Tianquan County, southwest China's Sichuan Province. (Xinhua/Jiang Hongjing)

Aerial photo taken on Dec. 10, 2020 shows clouds and mountains seen from the top of the Guangtou Mountain in Tianquan County, southwest China's Sichuan Province. (Xinhua/Jiang Hongjing)

Photo taken on Dec. 10, 2020 shows clouds and mountains seen from the waist of the Guangtou Mountain in Tianquan County, southwest China's Sichuan Province. (Xinhua/Jiang Hongjing)