Photo 1¡GPeople watch an ocean environment-monitor buoy model during the Qingdao International Ocean Science and Technology Exhibition in Qingdao, east China's Shandong Province, Sept. 12, 2018. The exhibition opened here on Wednesday, and will last for three days. (Xinhua/Liang Xiaopeng)
Photo 2¡GPeople watch a competition of underwater robots during the Qingdao International Ocean Science and Technology Exhibition in Qingdao, east China's Shandong Province, Sept. 12, 2018. The exhibition opened here on Wednesday, and will last for three days. (Xinhua/Liang Xiaopeng)
Photo 3¡GPeople watch an unmanned aerial vehicle during the Qingdao International Ocean Science and Technology Exhibition in Qingdao, east China's Shandong Province, Sept. 12, 2018. The exhibition opened here on Wednesday, and will last for three days. (Xinhua/Liang Xiaopeng)