详细解释:a. 有两副面孔的, 怀二心的, 口是心非的
英语解释：
形容词 janus-faced:
having or concerned with polarities or contrastsmarked by deliberate deceptiveness especially by pretending one set of feelings and acting under the influence of another- W.M.Thackeray同义词：ambidextrous, deceitful, double-dealing, duplicitous, two-faced, double-faced, double-tongued