Villagers ride on the ice-covered road in Longyan Township of Huanjiang Maonan Autonomous County, south China's Guangxi Zhuang Autonomous Region, Dec. 12, 2018. (Xinhua/Gao Dongfeng)

Snow covered forests are seen at Maoba Township of Youyang Tujia and Miao Autonomous County, southwest China's Chongqing, Dec. 13, 2018. (Xinhua/Chen Bisheng)

Egrets fly over the water of Huaihe River in Xuyi County of Huai'an City, east China's Jiangsu Province, Dec. 14, 2018. (Xinhua/Zhou Haijun)

Clouds move at the Lushan Mountain scenic spot, east China's Jiangxi Province, Dec. 14, 2018. (Xinhua/Qin Yongyan)

A frosted flower is seen at the Slender West Lake in Yangzhou, east China's Jiangsu Province, Dec. 14, 2018. (Xinhua/Meng Delong)

A monkey walks in the Dawei Mountain rhesus monkey valley in Liuyang City, central China's Hunan Province, Dec. 9, 2018. (Xinhua/Peng Hongxia)

A car runs on the road in Taierzhuang District of Zaozhuang City, east China's Shandong Province, Dec. 11, 2018. (Xinhua/Gao Qimin)

Swans rest on the swan lake in Rongcheng, east China's Shandong Province, Dec. 7, 2018. (Xinhua/Lin Haizhen)

Swans fly over a lake in Rongcheng, east China's Shandong Province, Dec. 7, 2018. (Xinhua/Wang Fudong)

Athletes practise at a ski ranch in Chongli, north China's Hebei Province, Dec. 14, 2018. (Xinhua/Wu Diansen)