n.冒名顶替者,江湖骗子(impostor);
例句:
He was an imposter, who masqueraded as a doctor.
他是个冒牌医生。
We discovered him to be an imposter.
我们发现他是个冒名顶替的骗子.
Anyone who speaks in the name of others is always an imposter.
以别人名义说话的人总是个欺世盗名者.