Jiang Shifa (L) and his wife Lian Shifang (R), volunteers for the Shanghai Cooperation Organization (SCO) Qingdao Summit, take bus to their posts in Qingdao, east China's Shandong Province, June 5, 2018. Jiang, 74 years old and his wife, 72 years old, have been volunteers for over ten years after retired from work. The couple feel thrilled to be volunteers for the upcoming SCO Qingdao Summit ten years after they served as volunteers for the Beijing 2008 Olympic Games Sailing event in Qingdao. (Xinhua/Jiang Kehong)