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Shan Zhixian (R), 77, volunteer as an interpreter at Lao She memorial house in Qingdao, east China's Shandong Province, June 1, 2018. The 18th Shanghai Cooperation Organization (SCO) Summit is scheduled for June 9-10 in Qingdao. Volunteers are easily seen on the street. (Xinhua/Zhu Zheng)