The bank warned customers about an imposture in which callers pretended to be branch managers.

銀行提醒客戶留意一起冒充事件，來電者假裝是分行經理。

Security staff uncovered his imposture when he failed to answer basic questions about the department.

他答不出部門的基本問題，保全人員因此識破他的冒充行為。

Her imposture as a hotel guest lasted two days before the front desk noticed the fake booking.

她假冒飯店房客住了兩天，櫃檯才發現那筆訂房是假的。