Aerial photo taken on Sept. 5, 2020 shows Chinese University of Hong Kong (Shenzhen)(down) and the Shenzhen MSU-BIT University (up) in Longgang District of Shenzhen, south China's Guangdong Province. Known as a paragon of opening-up and development, Shenzhen in Guangdong Province is one of China's earliest special economic zones. Starting from a small town, it has developed into a key economic hub in the past 40 years. (Xinhua/Mao Siqian)