我不知道为什么这样说。

I don't know why to say so.

youdao

我不知道为什么这样回答总是逗得他们大笑。

This answer always made them laugh and I did not know why.

youdao

我必须这样做——尽管我不知道为什么。

I must—though I don't know why.

youdao

我不知道为什么他们做出这样的选择。

I don't know why they make that choice.

youdao

我不知道为什么会出现这样的错误记录。

I don't know why, but this is wrong.

youdao

我也不知道为什么我会这样。

I don't know why I get like this.

youdao

的确是这样。许多中国人都这样做。我不知道为什么。

Cindy: That's true. Most Chinese do that. I don't know why.

youdao

是吗？我没有意识到。我不知道为什么会这样。

Really? I didn't realize it. I don't know why I became like this.

youdao

我不知道为什么会这样做，但我不能控制自己。

I'd no idea why I did that. I control myself.

youdao

我不知道为什么会这样做，但我不能控制自己。

I had no idea why I did that I couldn't control myself.

youdao

我不知道为什么会这样——看起来很不幸。

I wonder how that came about - it seems quite unfortunate.

youdao

不知何故我们成了朋友，我绝不知道为什么会这样。

Somehow or other we became friends, I never knew just why it was.

youdao

我可以肯定地说，我不知道为什么有人会这样讲。

I'm sure I don't know why people say this kind of thing.

youdao

不知道为什么，我就这样跟着他的步伐走着。

Do not know why, I followed him to the pace of this walk.

youdao

不知道为什么，我就这样跟着他的步伐走着。

Do not know why, I followed him to the pace of this walk.

youdao