Volunteer Tanjilul Islam (2nd R) of Bangladesh, an international student in Nanjing University of Aeronautics and Astronautics, poses with his teammates for photograph in the Nanjing Olympic Sports Center at the 2014 Nanjing Youth Olympic Games in Nanjing, capital of east China's Jiangsu Province, on August 14, 2014. According to the Local Organising Committee, there are about 20,000 volunteers, most born in the 1990s, playing different roles in spectator services, competition services, medical services, food services, IOC members services, etc. with their vigor and hospitality. (Xinhua/Yue Yuewei)