A college student volunteer joyfully tutors rural left-behind children, whose parents left to work in cities, beside a paddy field in Shibai villige, Sansheng town, Beibei district, Southwest Chongqing municipality on July 14, 2010. During summer vacation, many students of Southwest University in Chongqing municipality volunteer to go to rural areas to help and live with the left-behind children as part of their help-program to rural areas. [Xinhua/Photo]