The upper part (file) of this combo photo taken by Li Changyong shows a worker producing an electronic watch at a factory in Shenzhen, south China's Guangdong Province. The lower part of the combo photo taken by Mao Siqian on May 22, 2015 shows founder of Da-Jiang Innovations (DJI) Wang Tao (C) discussing with research staff in Shenzhen. This year marks the 40th anniversary of China's reform and opening-up policy. Over the past four decades, Shenzhen has developed from a small fishing village to a metropolis. (Xinhua)