I have to know exactly why it is I'm doing a particular job.

我必须确切地知道我为什么做某项工作。

《柯林斯英汉双解大词典》

That's why it is called a UFO!

这就是它被称为不明飞行物的原因！

youdao

Tell me why it screams so loud?

能告诉我为什么它这么大声的尖叫吗？

youdao

At the end, the puppeteers discussed why it is important to eat healthful foods such as fruits and vegetables.

VOA: special.2009.09.23

I didn't expect it to do this. If you understand why it did what it did, you're half way there.

这样运行的啊，如果你能弄明白为什么,它这么运行，你已经完成了差不多一半了。

麻省理工公开课 - 计算机科学及编程导论课程节选

And this is going to sound like a weird topic, we're going to see why it's of value in a second.

这听起来像个怪异的主题，我们将会去学习一刹那。

麻省理工公开课 - 计算机科学及编程导论课程节选

McKay explained why it was only Brown that had so far made a transfer request.

BBC: Kevin Thomson and Scott Brown are wanted by other clubs

Such principles are still alien to the IMF, which is why it remains a global menace.

FORBES: Fact and Comment

Once you learn it seems so easy, you wondered why it seemed so hard before.

FORBES: A Badly Needed Catalyst to Manage Complexity