20th anniversary of subway operation marked in Shenzhen

Staff members pose for photos during a celebration for 20th anniversary of Shenzhen Subway in Shenzhen, south China's Guangdong Province, Aug. 27, 2018. Shenzhen now has 7 subway lines, with total length of 265 kilometers and transporting an average of 4.28 million passengers per day.(Xinhua/Mao Siqian)