I don't know how you can say things like that.

真想不到你怎么会说出这种话来。

《牛津词典》

Think about what you want to say and, if you don't know, say, "I don't know, let's find out together".

考虑好你想说什么，如果你也不知道说什么的话，你可以告诉孩子‘我不知道，咱们一起找出答案吧’。

youdao

How do you say "I don't know" without sounding, well, dumb?

要怎样说“我不知道”才能让自己听上去不傻？

youdao

Well if I-- you know, with let me say it differently. I don't need to worry about how checking is done, it's handled inside of that function.

好，如果你们知道，抱歉，让我们换种说法,我不必担心检查工作,是则会么做的，这是在方法体内部进行的。

麻省理工公开课 - 计算机科学及编程导论课程节选

because there's, I don't know what to say, over 50, 60 colleges, you know, that are recognizable in California

因为在加州有，我不知道怎么说，有五六十多所众所周知的大学，

加州的大学 - SpeakingMax英语口语达人

So I don't know if it Does it matter what you say to babies as long as you say something.

所以我想知道,是不是只要你对婴儿说话就行,说话的内容并不重要

耶鲁公开课 - 心理学导论课程节选

And if you see her, won't you please say hello, because I don't know if I can do this alone.

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