The upper part (file) of this combo photo taken by Li Changyong shows an electronic equipment factory in Shenzhen, south China's Guangdong Province. The lower part of the combo photo taken by Mao Siqian on Feb. 27, 2018 shows workers at a factory of Foxconn Technology Group 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)