reform school

基本解释

School officials concluded that he had violated their zero-tolerance policy on weapons, and Zachary was suspended and now faces 45 days in the district’s reform school.
校方认为他违反了他们对武器的零容忍政策。扎贾里被停课，现在还面临到地方教养院“改造”45天的命运。
Some suggestions are given that to reform school PE education, in order to change students' spare time weak point of sport activity, improve the students' physical health.
建议改革学校体育教育，以改变学生余暇体育活动中的不足之处，提高学生的体质健康水平。
China's education is open to the world after her entry into WTO. In view of the sharp competition, vocational schools should learn from advanced enterprises and reform school management.
我国加入WTO后，教育要向国外开放，职业教育面临国内外竞争的压力，职业学校要借鉴企业的先进管理经验对学校的经营管理进行改革。

States are competing to share in almost three and a half billion dollars as part of a school reform competition.
So, his letters come out of this western land, New Mexico, and a land of criminality, the reform school.
他的信从新墨西哥这片西部的土地而来，还是寄宿学校这种犯罪滋生地。
耶鲁公开课 - 1945年后的美国小说课程节选
Then news came that Dean was out of reform school and was coming to New York for the first time; also there was talk that he had just married a girl called Marylou.
然后消息传来说安被寄宿学校开除了,将第一次来纽约;,还有传言说他刚和一个叫玛丽露的姑娘结婚了。
耶鲁公开课 - 1945年后的美国小说课程节选

Not bad for a kid abandoned by his parents and sent to reform school in his teens.
FORBES: Magazine Article

(especially in the past) a type of school where young people who have broken the law are sent instead of prison

A reform school is a kind of prison for young criminals, who are not old enough to be sent to ordinary prisons.