1. having or concerned with polarities or contrasts;

   "a janus-faced view of history"
   "a janus-faced policy"
   

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"
   "a double-dealing double agent"
   "a double-faced infernal traitor and schemer"
   

3. having two faces--one looking to the future and one to the past;

   "Janus the two-faced god"
   

THE Janus-faced nature of atomic power has inspired much writing.

核能的两面性为作家提供了诸多写作素材。

He's all the hidden secrets most of us have, "says Ian Abercrombie, who provides the smooth and silvery voice of the Janus-faced Sith Lord."

“他完全代表了我们大多数人都有的所有隐秘。”伊恩·艾伯克龙比说，他为这个双重身份的西斯尊主提供了平稳悦耳的声音。

Owing to the Janus-faced properties of copper in organisms, numerous efforts have been undertaken to develop efficient and selective methods to assess copper ions in cells and organisms.

由于Janus - faced在生物特性，为数众多的铜的努力开发效率，是进行选择性的方法评估和生物细胞内铜离子。