词源趣谈 | a wolf in sheep's clothing 披着羊皮的狼

a wolf in sheep's clothing 指表面上装好人、骨子里却不安好心的人。它出自“登山宝训”（《马太福音》〔Matthew〕第7章第15节）中耶稣所言：

Beware of false prophets, which come to you in sheep’s clothing, but inwardly they are ravening wolves.
你们要防备假先知。他们到你们这里来，外面披着羊皮，内心却是残暴的狼。