A woman walks past an installation in Qingdao, East China's Shandong province, June 3, 2018. The 18th Shanghai Cooperation Organization (SCO) Summit is scheduled for June 9 to 10 in Qingdao. [Photo/Xinhua]

Photo taken on June 4, 2018 shows an installation made of flowers in Qingdao, East China's Shandong province. The 18th Shanghai Cooperation Organization (SCO) Summit is scheduled for June 9 to 10 in Qingdao. [Photo/Xinhua]  

A streetcar runs on a street in Qingdao, East China's Shandong province, June 4, 2018. The 18th Shanghai Cooperation Organization (SCO) Summit is scheduled for June 9 to 10 in Qingdao. [Photo/Xinhua]