The upper part (file) of this combo photo taken by Chen Xuesi shows 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 Feb. 14, 2017 shows a night view of 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)