一个很难的题目用英语怎么说

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一个很难的题目用英语怎么说一个很难的题目用英语怎么说一个很难的题目用英语怎么说averydifficultsubjectaveryhardquestionaverydifficultsubjectaf

一个很难的题目用英语怎么说
一个很难的题目用英语怎么说

一个很难的题目用英语怎么说
a very difficult subject

a very hard question

a very difficult subject

a fairly difficult question

a difficult topic