"Celebrating with our family." "Presents!" "I usually get presents that say Santa Claus on them but I'm not really sure if they're from him."

VOA: special.2009.12.21

I'm sure you don't really know what that means.

也不知道这句的意思。

耶鲁公开课 - 旧约导论课程节选

But I'm not sure that you can really make that assumption based on something that someone creates

但我不确定你真的能基于某人创作的某些作品来做那样的推断，

印象深刻的展示会 - SpeakingMax英语口语达人

I like to have something that's my own, and continue writing too. I really, I'm not sure.

我想有点自己的东西，还想继续写作。我真的不确定。

为我的生活 - SpeakingMax英语口语达人

I'm not really sure that that's the case.

我不太确定情况就是这样的。

耶鲁公开课 - 公正课程节选

I'm just not sure that they really need all of that.

我只是不确定他们是否真的需要那样做。

纽约的交通手段 - SpeakingMax英语口语达人

And I'm sure that she's really interested in going as well.

我觉得她肯定也会很感兴趣。

Let me 实战 - SpeakingMax英语口语达人

I'm not really sure why that is.

我不知道为什么。

经济危机也能避开 - SpeakingMax英语口语达人