相关单词同義詞difficult problem, puzzler, 近義詞 problem 問題, riddle 謎, mystery 謎，神秘, enigma 難以理解的事物..., puzzle 難題, challenge 挑戰, unknown 未知的, knot 結, brain-teaser 難題臨近詞convection, controversy, Conundrums, Conundrum of Figure相似詞controverted election, contumacious, contumely, contusion, conurbation, convalesce, convalescence, convalescent, 返回 conundrum