There is a question mark over the future of geriatric care.

老年保健医学的未来是一个问号。

《柯林斯英汉双解大词典》

To me it looks like a question mark.

对我来说它就像一个问号。

youdao

Everything is a question mark; nothing is a full stop.

一切都是一个问号；没有什么是一个句号。

youdao

My back's crookedlike a question mark. Next to Mama,no one ever talked to me or asked me questions.

VOA: standard.other

I have no idea what's here at the moment so I'm just going to draw a question mark because that memory might have been used previously for some other purpose, but we know it's currently available to us so we have four bytes of memory.

我不知道在此刻这里是什么,所以我画一个问号，因为那块内存可能在之前,为其它的目的而使用过，但是我们知道它可以为我们所使用,这样我们就有4个字节的内存。

哈佛公开课 - 计算机科学课程节选

Here's where I come back to that example that I already gave you with a question mark next to it when I was talking about Saussure.

我这就要再讲一下我已经讲过的例子,就是我们讲索绪尔时讲到的那个存疑的例子。

耶鲁公开课 - 文学理论导论课程节选

In terms of the quality of the holdings, that can be a question mark as well.

FORBES: Are Your Commodity ETFs On The Right Track?

The whole thing is scary, because there's a question mark hanging over my head.

BBC: Disability benefit changes: Case studies

And it would raise a question mark over the means testing of social care.

BBC: Merge NHS and social care, says Labour