Aerial photo taken on July 1, 2018 shows the Olympic sailing center in Qingdao of east China's Shandong Province. The center, used as the conference hall during the 18th Shanghai Cooperation Organization (SCO) summit, after a brief remodification, was opened to the public from this Sunday. (Xinhua/Li Ziheng) 

Visitors take a tour inside the Olympic sailing center in Qingdao of east China's Shandong Province, July 1, 2018. The center, used as the conference hall during the 18th Shanghai Cooperation Organization (SCO) summit, after a brief remodification, was opened to the public from this Sunday. (Xinhua/Li Ziheng) 

Visitors take a boat trip around the Olympic sailing center in Qingdao of east China's Shandong Province, July 1, 2018. The center, used as the conference hall during the 18th Shanghai Cooperation Organization (SCO) summit, after a brief remodification, was opened to the public from this Sunday. (Xinhua/Li Ziheng) 

Visitors take a tour at the Olympic sailing center in Qingdao of east China's Shandong Province, July 1, 2018. The center, used as the conference hall during the 18th Shanghai Cooperation Organization (SCO) summit, after a brief remodification, was opened to the public from this Sunday. (Xinhua/Li Ziheng)