Volunteer Xu Ping (L) and her colleague patrol around the West Lake in Hangzhou, capital of east China's Zhejiang Province, Aug. 24, 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/Wang Dingchang)?