A visitor looks at an intelligent underwater robot during the China (Qingdao) International Ocean Science & Technology Exhibition in Qingdao, East China's Shandong province, Sept 26, 2016. The three-day exhibition kicked off here on Monday. [Photo/Xinhua]

Visitors look at a device for aquaculture by recycled water of factories during the China (Qingdao) International Ocean Science & Technology Exhibition in Qingdao, East China's Shandong province, Sept 26, 2016. The three-day exhibition kicked off here on Monday. [Photo/Xinhua]