双语常用典故：a wolf in sheep's clothing 批着羊皮的狼;貌善心恶的人

耶稣在加利利一带传道布教，收了很多信徒。有一天，他对门徒说:"Beware of false prophets, which come to you in sheep's clothing, but inwardly they are ravening wolves"

Eg: Mrs. Martin trusted the lawyer until she realized that he was a wolf in sheep's clothing One who teaches morality and practices immorality is a wolf in lamb's skine