VERB
揭露；揭发
If you unmask someone or something bad, you show or make known their true nature or character, when they had previously been thought to be good.
例句
Mr Burkett has unmasked several hundred impostors.
伯克特先生已经揭穿了数百个冒名顶替者。
He managed to pass top secret documents to East Berlin for many years before he was unmasked in 1974.
在1974年被揭穿身份的数年里，他设法成功地把一些绝密文件交给了东柏林。