我不知道你说的那本书还有没有了。

I'm not sure if the book you mentioned is still available.

youdao

“我不知道你到底在说什么！”他气势汹汹地说。

'I don't know what you're talking about,' he blustered.

《牛津词典》

阿伦小姐对他笑道：“你很会猜， 我确实不知道你怎么办到的。”——杰姆斯说：“推论。”

Miss Allan beamed at him. "You are clever to guess. I'm sure I don't know how you did it."—"Deduction," James said.

《柯林斯英汉双解大词典》

But if you say, well, I don't know how to do this, I am not going to bother, don't grade the paper.

但是如果你说，好吧，我不知道怎么做这个，我想麻烦，别给试卷评分。

麻省理工公开课 - 固态化学导论课程节选

Other people might say, well you know, I'm really an adventurer--I don't care too much about risk-- I want the much higher return.

其他的人可能会说，你知道的，我就是一个投机商我不怎么在乎风险-,我只想要更高的收益。

耶鲁公开课 - 金融市场课程节选

So, for those of you who have never heard French before, when you hear somebody say, "Je ne sais pas" you could say, "Remarkable!

因此,对于那些从未听过法语的人来说,当你听到有人说,"我不知道",你可能会说,"太神奇了

耶鲁公开课 - 心理学导论课程节选