Tourists take photos at the May Fourth Square in Qingdao, east China's Shandong Province, May 31, 2018. The 18th Shanghai Cooperation Organization (SCO) Summit is scheduled for June 9-10 in Qingdao. (Xinhua/Zhu Zheng)
A gardener waters the flowers at the May Fourth Square in Qingdao, east China's Shandong Province, May 31, 2018. The 18th Shanghai Cooperation Organization (SCO) Summit is scheduled for June 9-10 in Qingdao. (Xinhua/Zhu Zheng)
Photo taken on May 31, 2018 shows the scenery in Qingdao, east China's Shandong Province. The 18th Shanghai Cooperation Organization (SCO) Summit is scheduled for June 9-10 in Qingdao. (Xinhua/Yin Gang)
Tourists take photos at the May Fourth Square in Qingdao, east China's Shandong Province, May 31, 2018. The 18th Shanghai Cooperation Organization (SCO) Summit is scheduled for June 9-10 in Qingdao. (Xinhua/Guo Xulei)
Photo taken on May 31, 2018 shows the scenery in Qingdao, east China's Shandong Province. The 18th Shanghai Cooperation Organization (SCO) Summit is scheduled for June 9-10 in Qingdao. (Xinhua/Guo Xulei)
Tourists take photos at the corner of Daxue road and Yushan road in Qingdao, east China's Shandong Province, May 31, 2018. The 18th Shanghai Cooperation Organization (SCO) Summit is scheduled for June 9-10 in Qingdao. (Xinhua/Purbu Zhaxi)
Photo taken on May 31, 2018 shows the scenery in Qingdao, east China's Shandong Province. The 18th Shanghai Cooperation Organization (SCO) Summit is scheduled for June 9-10 in Qingdao. (Xinhua/Guo Xulei)
Photo taken on May 31, 2018 shows the scenery in Qingdao, east China's Shandong Province. The 18th Shanghai Cooperation Organization (SCO) Summit is scheduled for June 9-10 in Qingdao. (Xinhua/Yin Gang)