Volunteer Guo Xingzhe (L) distributes G20 Summit brochure to passengers at a railway station in Hangzhou, capital of east China's Zhejiang Province, July 31, 2016. More than 4,000 students from China and abroad will participate in voluntary service during next month's G20 Summit in Hangzhou. Over 1 million local residents have participated in safety and publicity related voluntary work since December, and will continue to offer services during the summit. (Xinhua/Huang Zongzhi)