Rafael Sky City -- a landmark project marking the Yangtze River Delta regional integration, fully resumed its construction work on Thursday after a long hiatus of 20 days due to the outbreak of COVID-19. Over 300 construction workers and administrative staff have returned and assumed their duties. The total length of the high-tech corridor, G6, is 1.5 kilometers. Upon completion, it will emerge as the world's longest air-corridor. (Photos: Yang Hui/GT)