Workers dance to warm themselves during lunch break in Danzhou No.4 Tunnel of Sanjiang-Liuzhou Expressway in Liuzhou City, south China's Guangxi Zhuang Autonomous Region, Jan. 12, 2017. The expressway linking Sanjiang and Liuzhou cities will be put into trial operation ahead of the Spring Festival, which falls on Jan. 28 this year. (Xinhua/Li Hanchi)