Along with the process of urbanization in China, while many young and middle-aged male laborers migrate from the countryside to cities for jobs, a large number of women, children, and the elderly are left in the countryside, who have received much attention as special groups. They have the nickname of “386199 troop,” with the number of “38” referring to women because March 8 is Women’s Day, “61” referring to children because June 1 is Children’s Day, and “99” referring to the elderly because September 9 of lunar calendar is the Double-Nine Festival for the elderly in China.