Aerial photo taken on April 15, 2020 shows the construction site of the westward extension section of Huayan tunnel at Chongqing Hi-tech Zone in Chongqing, southwest China. In recent days, local authorities of Chongqing Hi-tech Zone have sped up efforts to strengthen infrastructure construction under strict measures taken to fight against the COVID-19, which will lead to better transportation and communication conditions in the region. (Xinhua/Wang Quanchao)
