question mark
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这地方你得用个问号。
You need to use a question mark here.
unknown factor; unsolved problem
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他到底能不能康复还是个问号。
There is still some doubt as to his recovery. / Nobody is sure about his recovery.
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公司的前途还是个问号。
A question mark hangs over the future of the company.
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我脑子里全是问号。
My mind is crowded with whys.