详细解释:a. 两面可用的, 伪善的, 口是心非的
英语解释：
形容词 double-faced:
(of fabrics) having faces on both sidesmarked 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, Janus-faced, two-faced, double-tongued