To re-educate someone is to teach them again, so they think or behave in a new way. The re- means again: they already learned one way, and now someone is trying to replace it.

To re-educate someone 讓某人re-educate is to teach them again 就是再教他們一次, so they think or behave in a new way 好讓他們用新的方式想事情或做事情。The re- means again re-這個字首意思是「再一次」: they already learned one way 他們原本已經學過一種方式, and now someone is trying to replace it 現在有人想要換掉它

It can sound quite gentle. A hospital may re-educate patients about salt; a company may re-educate staff to use a new computer system.

It can sound quite gentle 這可以聽起來滿溫和的。A hospital 醫院 may re-educate patients about salt 可能會再教育病人關於鹽的知識; a company 公司 may re-educate staff to use a new computer system 可能會再教育員工使用新的電腦系統

Though actually, it can also sound hard and political. In news and history, re-educate often means forcing people to drop old beliefs and take the government’s beliefs. That use is cold, not kind.

Though actually 不過其實, it can also sound hard and political 這也可以聽起來很強硬、很政治。In news and history 在新聞跟歷史裡, re-educate often means forcing people to drop old beliefs and take the government's beliefs re-educate常常是指強迫人們放棄舊信念、接受政府的信念。That use is cold, not kind 這種用法是冷酷的，不是善意的

In ordinary school talk, teachers more often say teach again, train again, or help someone change a habit, because re-educate can make a listener think of that darker meaning. You re-educate a person, not a school subject.

In ordinary school talk 在一般學校用語裡, teachers more often say teach again, train again, or help someone change a habit 老師比較常說「再教一次」「再訓練一次」或「幫某人改掉習慣」, because re-educate can make a listener think of that darker meaning 因為re-educate會讓聽的人聯想到那個比較黑暗的意思。You re-educate a person 你re-educate的對象是人, not a school subject 而不是一個學校科目

British spelling often keeps the hyphen before a vowel (re-educate); American spelling often writes reeducate.

British spelling 英式拼法 often keeps the hyphen before a vowel (re-educate) 母音前常保留連字號（re-educate）; American spelling 美式拼法 often writes reeducate 常常寫成reeducate