20th anniversary of subway operation marked in Shenzhen

Boys pose for photos in front of a 3D-painting of a subway train during an exhibition 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)