你说的对，我只是不知道为什么大家都回复这个问题。

You said it. I just don't know why everyone replies this question.

youdao

我无法立即回复这个建议。

I can't respond to this proposal immediately.

youdao

我不能确切的回复这个，因为我只有个人观念。

I can't reply it exactly for I just have the personal opinion.

youdao

And I responded to at least one email about this issue, someone quite correctly said tuple are immutable, how can I change one?

我在不止一封邮件里回复了这个问题,一些人很明智，知道元组不可变,但是疑问怎么能去改变他们，我的答案是？

麻省理工公开课 - 计算机科学及编程导论课程节选

you could leave your response to the invitation slightly open-ended by saying you're not sure.

你可以表示你不确定，开放性地回复这个邀请。

I don't know 课堂 - SpeakingMax英语口语达人