出处：按学科分类—语言、文字 中国对外翻译出版公司《汉英成语词典》第58页（195字）
比喻外貌和善而内心卑劣狠毒，例从他平时那种和善慈祥的态度看，绝想不到他会是个人面兽心的家伙。
It is quite unthinkable that he is such a devil of a man when he usually looks so gentle and kind．