Children have fun at a ski resort in Yantai City, east China's Shandong Province, Jan. 12, 2020. (Photos: Xinhua)

People play ice hockey on a frozen lake in Mentougou District of Beijing, capital of China, Jan. 12, 2020.

People have fun on a frozen lake in Mentougou District of Beijing, capital of China, Jan. 12, 2020.

Children have fun at a ski resort in Yantai City, east China's Shandong Province, Jan. 12, 2020.

Children practise skiing at a ski resort in Yantai City, east China's Shandong Province, Jan. 12, 2020.

A child plays curling on a frozen lake in Mentougou District of Beijing, capital of China, Jan. 12, 2020.