说话者是在什么时候交谈的？

When are the speakers talking?

youdao

对了，你说这张照片是在什么时候拍的？

By the way, when did you say this photo was taken?

youdao

国庆节是在什么时候？

When is National day?

youdao

If you've got a problem that has units associated with it, do the exercise of carrying the units through because, guess what?

如果你做到一个跟单位有关的题目，请你在做题目的时候密切注意它，因为，猜猜是什么？

麻省理工公开课 - 固态化学导论课程节选

We'll never find Truth in her entirety, at least not until the Second Coming, and who knows when that will be?

我们永远找不到完整的真理，至少在第二次到来之前不能，谁知道那将是什么时候呢？

耶鲁公开课 - 弥尔顿课程节选

So, remember when we talk about Coulomb force, what's holding the nucleus and the electron together, there's 2 things we need to think about.

还记得我们在讨论库仑力的时候，提到是什么将原子核与电子束缚在一起时，有两点需要考虑。

麻省理工公开课 - 化学原理课程节选