Aerial photo taken on Dec. 20, 2020 shows the scenery in Longtoushan scenic area during sunrise in Nanzheng District of Hanzhong, northwest China's Shaanxi Province. (Xinhua/Tao Ming)

Aerial photo taken on Dec. 20, 2020 shows the scenery in Longtoushan scenic area during sunrise in Nanzheng District of Hanzhong, northwest China's Shaanxi Province. (Xinhua/Tao Ming)

Aerial photo taken on Dec. 20, 2020 shows the scenery in Longtoushan scenic area during sunrise in Nanzheng District of Hanzhong, northwest China's Shaanxi Province. (Xinhua/Tao Ming)

Aerial photo taken on Dec. 20, 2020 shows tourists enjoying the snow scenery in Longtoushan scenic area in Nanzheng District of Hanzhong, northwest China's Shaanxi Province. (Xinhua/Tao Ming)