to raise a tough question 出难题
a tough question 难回答的问题
Hmmm. This is a tough question.
嗯，这是一个很难回答的问题。
youdao
This is a tough question.
这是个很难的问题。
That "s a tough question to answer."
那是一个很难回答的问题。
There we go, okay. So here's the tough question.
就你了,我问个有难度的问题
耶鲁公开课 - 博弈论课程节选
That's a tough question.
这问题比较难回答。
艺术画廊，来吧 - SpeakingMax英语口语达人
Without doubt, these are tough question, but probably ones that everyone should periodically address.
FORBES: What's Your Personal Brand?
How to do that is a tough question with the left now dominant in Washington, academia and the media.
FORBES: It's Time To Restore Liberty
The tough question is whether governments will enact the reforms needed to sustain the recovery.
ECONOMIST: The euro��s agony, Europe��s opportunity
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