The key question is what to do when.

关键问题是什么时候应该用什么。

youdao

But as anybody who has ever recruited staff knows, the key question is whether she really wants the job.

不过做过招聘工作的人都知道，关键性的问题还是在于她是否真的想要这份工作。

youdao

The key question is whether the savings in licensing fees for proprietary products outweigh the additional costs in manpower to integrate and operate the free alternative.

关键问题在于免去专利软件许可证所省下的钱，是否高于整合及使用它们的免费替代品所带来的额外人力资源成本。

youdao

Analysts say a key question is whether Russia will continue to insist missile defense be linked to the conclusion of an arms-control agreement.

VOA: standard.2009.07.15

What I'm considering right now is the question whether sameness of soul is the key to being the same person.

我现在考虑的问题是,同样的灵魂,是否就是成为同一个人的关键。

耶鲁公开课 - 死亡课程节选

In thinking about how to break down what was described as a "conspiracy of silence", the Chief Constable of Great Manchester Police Sir Peter Fahy has told me that key is the question of legitimacy.

BBC: The police are the public and vice versa

The key question is whether stationing U.S. troops on the Golan Heights for any reason is a good or a bad idea.

CENTERFORSECURITYPOLICY: A US force for the Golan Heights? A roundtable discussion

Yet the right question is often the key to breakthrough business success.

FORBES: Asking the Right Question