enigma [ɪˈnɪɡmə]

例句:

• Iran remains an enigma for the outside world.
  对于外界而言，伊朗仍是个谜。
  
• Russia is a riddle wrapped in a mystery inside an enigma.
  俄罗斯是被包藏在一个闷葫芦里面的神秘物体之中的谜.
  
• It is an enigma to me.
  它对我来说是个迷.
  
• New research has begun to address this enigma.
  来自SA
• Vaman Ghiya was an enigma in Jaipur's tight-knit art world.
  来自NEWYORKER
• So began one of the most exciting periods of Enigma code-breaking.
  来自BBC