名詞 conundrum:

1. a difficult problem
   同義詞：riddle, enigma, brain-teaser

co.nun.drum

n.（名詞）
A riddle in which a fanciful question is answered by a pun.
謎語：由一個(gè)奇妙的問題組成的謎語，其答案為雙關(guān)語
A paradoxical, insoluble, or difficult problem; a dilemma:
復(fù)雜難題：自相矛盾的、無法解決的或難以解決的問題；進(jìn)退維谷：
例句：
.the conundrum, thus far unanswered, of achieving full employment without inflation.(Arthur M. Schlesinger, Jr.)
.如何既不引起通貨膨脹又能實(shí)現(xiàn)全民就業(yè)這個(gè)尚未解決的難題.(小阿瑟M.施萊辛格)

來源：
[Origin unknown]
[詞源不知]