I don't know why he bothers me with this kind of rubbish.

我不明白他为何用这种烂事来烦我。

柯林斯例句

"I don't know why they left," he said dolefully.

“我不知道他们为什么离开，”他哀愁地说道。

柯林斯例句

I don't know why I never thought of that.

我怎么就从未想到过那一点。

柯林斯例句

Do you know why he was mulling and hesitating?

你知道他为什么前思后想、犹豫不决吗？

柯林斯例句

I don't know why.

我不知道为什么.

柯林斯例句

I don't know why he held his cards close to his chest.

我不知道他为何一直守口如瓶.

《简明英汉词典》

I don't know why I feel so fed up this morning.

我不知道为什么今天上午情绪这么低落.

《简明英汉词典》

Do you know why he was late?

你知道他为什么迟到 吗 ?

《现代英汉综合大词典》

"I come on strong sometimes. Don't know why." She was beginning to feel like a bully.

“我有时言行很过分，不知道为什么。”她开始感觉自己像个恶霸。

柯林斯例句

I don't know why everybody makes such a fuss about a few mosquitoes.

我不知道为什么大家对几只蚊子大惊小怪的。

柯林斯例句

You all know why I am here. So I won't waste time on preliminaries.

你们都知道我来这里的目的。所以我就闲话少说了。

柯林斯例句

I would like to know why we pensioners are being so badly treated.

我想知道为什么我们这些领养老金的人受到如此恶劣的对待。

柯林斯例句

Hi everyone, we all know why we are here today, so let's cut to the chase.

嗨，各位，大伙儿都知道今天我们为什么在这里，那就直入正题吧。

柯林斯例句

You should know why we decided to strike while the iron was hot.

你应知道我们为什么决定趁热打铁.

《简明英汉词典》

I don't know why, but she's really got her knife in him at the moment.

我不知道什么原因, 只知道她现在还对他怀恨在心.

《简明英汉词典》