brain-teaser

英 [ˈbreɪn tiːzə(r)]

美 [ˈbreɪn tiːzər]

n.  有趣的难题

复数：brain-teasers　

牛津词典

noun

• 有趣的难题
  a problem that is difficult but fun to solve

英英释义

noun

• a difficult problem
  Synonym:riddleconundrumenigma