reform school
noun [ C ] uk/rɪˈfɔːm ˌskuːl/ us/rɪˈfɔːrm ˌskuːl/ (US also reformatory, /rɪˈfɔːm.ə.tər.i/ /rɪˈfɔːrm.ə.tɔːr.i/)
（尤指旧时的）感化院，少年管教所，青少年教养院
(especially in the past) a type of school where young people who have broken the law are sent instead of prison
His first conviction, for burglary, sent him to reform school at age 10. 他的第一个罪名是盗窃，并因此在10岁时被送进了感化院。