open to question

基本解释

But his hold on power is increasingly open to question.
但他拒不放权却日渐成为问题。
If approvals are needed (this in itself might be open to question), can the approval process be made asynchronous?
如果需要批准的话（这本身就是有一个问题），批准过程是不是可以异步地进行？
Joining forces with HSBC, which has big businesses in many places, may make sense on paper, but whether the two could work together is open to question.
跟在很多地方拥有大生意的HSBC联合起来，桌面上来说可能有点意思，但是这两家到底肯不肯在一起合作仍然是个大问题。

So here's my attempt to make the question both a bit more precise, and a question that's an open question.
我正尝试,让这两个问题变得更准确,这是个开放性的问题
耶鲁公开课 - 死亡课程节选
It's an open question whether you'll believe it when this class comes to an end, but I'd be surprised if many of you believe it now.
即使到课程结束时,能否接受这个观点,依然是你们的自由,相反,你们要现在就能接受,倒是会让我感到很奇怪
耶鲁公开课 - 心理学导论课程节选
Paradise Lost as a whole clearly wants us to believe that God has foreknowledge and it also clearly wants us to believe that we have free will, but the similes seem just as often to open up and to question the poem's doctrinal conclusions.
整体来说很清楚地是想让我们相信,上帝具有先知的能力,并且还想让我们相信人生来有自由的意志，但是这些比喻看起来只是为我们揭露,并质疑了诗歌本身的学理上的总结。
耶鲁公开课 - 弥尔顿课程节选

Still, whether politics will continue to be divided along crude sectarian lines remains open to question.
ECONOMIST: Why peace is now possible