A worker receives a face mask before entering the construction site of China Eastern Airlines' production auxiliary area (phase one) in Chengdu Tianfu International Airport in Chengdu, southwest China's Sichuan Province, Feb. 11, 2020. The construction of China Eastern Airlines' production auxiliary area (phase one) in Chengdu Tianfu International Airport has resumed as a demonstration construction site in Chengdu. Chengdu Municipal Housing and Urban-Rural Development Bureau launched a series of measures to prevent and control the outbreak of coronavirus, demanding that all the construction projects in the city meet epidemic prevention standards before applying for resumption. (Photo by Xu Bingjie/Xinhua)