The left part (file) of this combo photo taken by Li Changyong shows Shennan Road in Shenzhen, south China's Guangdong Province. The right part of the combo photo taken by Mao Siqian shows the same road on May 23, 2018. 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)