conundrum 

  1. 名詞
難題, 複雜難解的問題
糾結點
謎語
機智問答
/此名詞複數可為"conundrums"或"conundra"/

    同義字詞
enigma,head-scratcher,mystery,mystification,puzzle,puzzlement,riddle,secret

例句

  1. But this is the conundrum we have .
  2. There is a conundrum in each level.
  3. Congress , he said, faces a conundrum .
  4. What is at the root of this conundrum ?
  5. But this is the conundrum that confronts me.