Say 'hi' to Chinese volunteers on International Volunteer Day!

Photo taken on June 4, 2018, shows volunteers greeting guests at the registration center for the 18th meeting of the Council of Heads of State of the Shanghai Cooperation Organization (SCO) in Qingdao, Shandong Province. The coastal city hosted the 18th Shanghai SCO Summit from June 9 to 10. [Photo: Xinhua]