Photo taken on June 25, 2019 shows the underground factory of Dalian Gona Technology Group Co., Ltd. in Dalian, northeast China's Liaoning Province. The 2019 Summer Davos Forum is held from July 1-3 in northeast China's coastal city of Dalian. Established by the World Economic Forum in 2007, the forum is held annually in China, alternating between the two port cities of Dalian and Tianjin. Summer Davos helped Dalian reshape the landscape of regional economy and strengthen the port's trade with other markets. Dalian has become an international city and a showpiece of China's reform and opening up. (Xinhua/Yao Jianfeng)