This is not a question of if.It's a question of who and when.

所以说这不是如果的问题，是谁和什么时候的问题。

youdao

This is not a question of if. It's a question of who and when.

所以说这不是如果的问题，是谁和什么时候的问题。

youdao

Who invented the paper? And when was the paper invented?

纸是什么时候，由谁发明的？

youdao

On the South Side of Chicago, I worked with families who had lost jobs and lost hope when the local steel plant closed.

VOA: special.2009.01.12

There they are. And, when they are named, they are named by suggestion by the scientist who have isolated them.

它们在这，当它们被起名的时候，是由科学家们建议的,那些提取它们的科学家。

麻省理工公开课 - 固态化学导论课程节选

You didn't know who wrote it, where, when, how, why, and someone says to you, "I want you to draw some conclusions about that piece of writing.

你不知道是谁，在哪里，什么时间，怎么样，为什么要写,然后你被要求对篇文章，做一个总结。

耶鲁公开课 - 旧约导论课程节选

But, when it comes down to it, the only people who know the "who and when" aren't talking.

CNN: VP fever intensifies as conventions near

Even though we had had a team that had worked for years researching and designing the school for no money, we were told that none of them could be hired because union rules dictated who and when we could hire.

CNN: Commentary: Good schools aren't only for rich kids

"Tolkien is remembered by Rose as a gentle man who loved nature, and who, when he felt tired while out walking, would just lie down and have a nap, " he said.

BBC: Did Gollum get his name from a cave in the Irish Burren?