Technicians check the video feed from a robot that carries out additional inspection for the coming G20 summit at a 220 kilovolt substation in Xiaoshan District of Hangzhou, capital of east China's Zhejiang Province, May 27, 2016. A 100-day countdown for the Group of 20 (G20) 2016 summit was launched on Friday in Hangzhou. (Xinhua/Huang Zongzhi)
