conundrum

conundrum
[kəˈnʌndrəm]
(pl. conundrums)
  1. a confusing and difficult problem or question
    复杂难题
    one of the most difficult conundrums for the experts.
    对专家们来说最难的难题之一。
    ■a question asked for amusement, typically one with a pun in its answer; a riddle
    (尤指答案中含双关语的)谜语
语源
  1. late 16th cent.: of unknown origin, but first recorded in a work by Thomas Nashe, as a term of abuse for a crank or pedant, later coming to denote a whim or fancy, also a pun. Current senses date from the late 17th cent
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