The upper part (file) of this combo photo taken by Chen Xuesi shows taxies in Shenzhen, south China's Guangdong Province. The lower part of the combo photo taken by Mao Siqian on June 24, 2018 shows electric taxies in Shenzhen. As of this April, the number of electric taxies in Shenzhen has topped 13,000. 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)