资料来源 : pyDict

有两面的

资料来源 : Webster's Revised Unabridged Dictionary (1913)

Bifacial \Bi*fa"cial\, a. [Pref. bi- + facial.]
   Having the opposite surfaces alike.

资料来源 : WordNet®

bifacial
     adj : having two faces or fronts; "the Roman Janus is bifacial"
           [syn: {biface}]