dou·ble-faced /ˌdʌbəlˈfest/
  (a.)兩面可用的;口是心非的
  Dou·ble-faced a.
  1. Having two faces designed for use; as, a double-faced hammer.
  2. Deceitful; hypocritical; treacherous.
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  double-faced
       adj 1: (of fabrics) having faces on both sides; "damask is a
              double-faced fabric"
       2: marked by deliberate deceptiveness especially by pretending
          one set of feelings and acting under the influence of
          another; "she was a deceitful scheming little thing"-
          Israel Zangwill; "a double-dealing double agent"; "a
          double-faced infernal traitor and schemer"- W.M.Thackeray
          [syn: ambidextrous, deceitful, double-dealing, duplicitous,
           Janus-faced, two-faced, double-tongued]