Someone who is an impostor is dishonestly pretending to be someone else in order to gain an advantage.
例句
He was an imposter, who masqueraded as a doctor.他是個(gè)冒牌醫(yī)生。
英漢詞典釋義
n.
冒名頂替者;騙子
This is not Doctor Malcolm, he is an impostor.這不是馬爾科姆醫(yī)生, 他是騙子。No impostor could deceive him;someone had put him up to all their tricks.任何騙子也騙不了他,有人已經(jīng)把他們的一切圈套告訴了他。