Any friend of MINE walks where he likes in this country, or I'll know the reason why!

在这个国家，我的任何朋友都可以到他喜欢的任何地方去散步，否则我就得知道原因！

youdao

I'd like to know the reason why you're so late.

我想知道你为什么迟到那么长时间。

《牛津词典》

I don't know the reason why you were absent from the meeting.

我不知道你为什么缺席会议。

youdao

And this is the reason why enthalpy was invented and why it's so important. Because we want to know this. So this for a finite change.

这也就是为什么焓要被提出,而且如此重要的原因,因为我们想要知道这些。

麻省理工公开课 - 热力学与动力学课程节选

I started thinking, you know what, the reason why in the United States we have such a problem,

你知道我开始想什么了吗，我在想为什么在美国我们会出现如此的问题，

发挥创造力的瞬间 - SpeakingMax英语口语达人

And one reason why we know that is in studies like the IAT, the Implicit Attitudes Test.

之所以这样说，是因为,像内隐态度测试这样的实验。

耶鲁公开课 - 心理学导论课程节选

Solution focused wants to know the reason why.

FORBES: Four Signs a Relationship Is Failing

The reason why Roger does not know the meaning of the word hangover is the same reason why his cider is so revered, why people will travel 400 miles to sit in his draughty farmhouse.

BBC: England's West Country: Still the apple of our eye

Now the reason why we know or we believe that one of the suspects in London was in e-mail contact with Bahaji's wife is because that was revealed by the German interior minister on German television yesterday.

NPR: Airline Plot Investigation Quietly Moves Forward