VERB
揭露；揭發
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.
伯克特先生已經揭穿了數百個冒名頂替者。
He managed to pass top secret documents to East Berlin for many years before he was unmasked in 1974.
在1974年被揭穿身份的數年里，他設法成功地把一些絕密文件交給了東柏林。