傻大明白
a difficult problem或a difficult question 或a tough\hard problem\question 都可以,这比较口语化。
若曦0518
一道难题:A Difficult Problem例句:1.We faced with a difficult problem.我们碰到了一个棘手的难题。2.Describe a difficult problem you 've dealt with?描述一下你是怎么处理问题的?3.It is a difficult problem to fabricate deep and small holes.深小孔加工一直是机械制造领域的难题之一。4.Our last caller described a difficult problem in her marriage.我们刚才那位来电者描述了她婚姻上一个难题。
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