?难题
... 难题 = conundrum 难题 = conundrums 难题 = difficult problem ...
?脑筋急转弯
... nursery rhyme 童谣 conundrums 脑筋急转弯 famous quotations 名人名言 ...
商闲服解惑
英汉双解词典包含3185865条英汉词条,基本涵盖了全部常用单词的翻译及用法,是英语学习的有利工具。