A group of youngsters flash victory signs in one of Peking University's exhibition halls, July 22, 2016. A total of 217 left-behind children, 9 to 17 years old, from Heilongjiang and Shanxi provinces and Xinjiang region, were invited by the All-China Federation of Trade Unions to tour Beijing for a week, free. The parents of these children are migrant workers who've left their hometowns to earn money to support their families, so the youngsters end up with the moniker 'left-behind'children. [Photo by Zou Hong/chinadaily.com.cn]