The upper part (file) of this combo photo taken by Li Changyong shows Jiang Weishui working at the construction site of an international trade center in Shenzhen, south China's Guangdong Province. The lower part of the combo photo taken by Mao Siqian on April 18, 2015 shows Wang Hua working at the construction site of Ping'an International Financial Center 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)