Photo taken on Jan. 14, 2019 shows icicles at Heilaoguo valley scenic spot in Xiansheng Township of Qingyang, northwest China's Gansu Province. (Xinhua/Li Xiao)

　　Photo taken on Jan. 14, 2019 shows icicles at Heilaoguo valley scenic spot in Xiansheng Township of Qingyang, northwest China's Gansu Province. (Xinhua/Li Xiao)

　　A man takes photos of icicles at Heilaoguo valley scenic spot in Xiansheng Township of Qingyang, northwest China's Gansu Province, Jan. 14, 2019. (Xinhua/Li Xiao)

　　Photo taken on Jan. 14, 2019 shows icicles at Heilaoguo valley scenic spot in Xiansheng Township of Qingyang, northwest China's Gansu Province. (Xinhua/Li Xiao)

　　Photo taken on Jan. 14, 2019 shows icicles at Heilaoguo valley scenic spot in Xiansheng Township of Qingyang, northwest China's Gansu Province. (Xinhua/Li Xiao)