I know that Ren should be a 68-year-old student majoring in heating in the Department of Health Engineering of Chongqing Jianzhu University. Because I didn't finish my studies during the Cultural Revolution, at the end of 1968, the central government unified graduation and left school (no diploma was issued), and some of them went to the army farm to work and exercise, and some were assigned to the army. Ren Ying joined the army in this way. Because in the 1980 s, fifth-grade students could return to the furnace to pay tuition fees and then issue diplomas, which is why the elderly do not issue diplomas. This is normal, and it's not that person's problem, let alone dropping out of school.