现在已经很晚了—为什么不就睡这儿呢？

It's very late now—why don't you sleep over?

《牛津词典》

请问你为什么直到现在才提及此事呢？

Might I enquire why you have not mentioned this until now?

《牛津词典》

你为什么现在要推出这个？

Why are you rolling this out now?

youdao

So when I expand this gas adiabatically and it cools down, why do you think it might cool down?

现在我们知道了气体绝热膨胀时,温度会下载，为什么会降温？

麻省理工公开课 - 热力学与动力学课程节选

So, again, this is why I'm disclaiming that this isn't all that interesting yet, but what am I doing.

此外，这就是为什么我放弃那个，这个不是那么,有趣，不过我现在在做什么呢？

哈佛公开课 - 计算机科学课程节选

As you're settling into your seats, why don't we take 10 more seconds on the clicker question here.

你们现在都坐在座位上了，为什么不用10多秒的时间,来做这道选择题呢？好的。

麻省理工公开课 - 化学原理课程节选