The teacher smiled, didn’t know why though.

老师面带微笑，不知道他乐什么。

youdao

Though why on earth you should want to have a Banquet in the morning I cannot understand.

虽然我不明白你到底为什么要在早上举行宴会。

youdao

I must—though I don't know why.

我必须这样做——尽管我不知道为什么。

youdao

That's why I am paying attention more." Jobs have continued to disappear, though at slower rates.

VOA: special.2009.08.21

But for me, I like to look at something and just say, "I like this. I don't really know why though."

但对我来说，我喜欢看着某个东西，然后说，“我喜欢这个。但我也不知道为什么。”

关于现代美术 - SpeakingMax英语口语达人

Why not then say,similarly,even though my body's still alive, nothing wrong about removing the heart if the person is dead.

这样为什么不能说，即使肉体依然生存，但是个人已经死亡时摘除心脏是可以的。

耶鲁公开课 - 死亡课程节选

The formula is so simple it makes you wonder why nobody though of it before.

CNN: Making the poor count -- a Hugo Chavez legacy

Why, though, should Mr Milosevic, so recently denounced in Washington as the main cause of current woe, do business?

ECONOMIST: Kosovo

Why, though, allow yourself to be ambushed if you are a female?

ECONOMIST: Males can take many routes to reproductive success