The upper part (file) of this combo photo taken by Li Changyong shows a TV production line in Shenzhen, south China's Guangdong Province. The lower part of the combo photo taken by Mao Siqian on June 13, 2018 shows a production line of flexible screens 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)