imposter

The hospital discovered that the new doctor was actually an imposter with no medical training.

医院发现这位新医生其实是个冒名顶替者，根本没有接受过医学培训。

Several imposters tried to gain access to the exclusive event by using fake invitations.

几个冒名顶替者试图使用假邀请函混入这场独家活动。

She felt like an imposter among the seasoned professionals at the conference.

在会议中，她在一群经验丰富的专业人士中感觉自己像个冒名顶替者。