This was very big in an ad campaign at least last year, I'm not sure if it still is, with the little butterfly.

它的广告宣传做得很大，至少在去年是这样的，我不确定它现在还是不是，它这里有一个小蝴蝶。

麻省理工公开课 - 化学原理课程节选

They've done some research. I'm not exactly sure if you can officially learn language from watching movies,

他们做了些研究。我不确定从官方的角度来讲，你是不是能够边看电影边学英语，

英语学习技巧 - SpeakingMax英语口语达人

It is a much scarrier idea than saying I have this, I'm going to do it, I'm going to put it down there as opposed to being open to what may come and being uncertain whether that would be something good enough.

这和，我知道了，我要做这个，我想写这个，这种确定感相比,对可能的结果保持一种开放的心态，不知道,期待能否满足的未知感相比，更挑战一些。

普林斯顿公开课 - 人性课程节选

What extent was the primitive form of Primitive form of what I'm not sure that that concept makes-- No, the answer is no, because nobody was compelled to do anything.

原始形态的比重,什么的原始形态,我不确定那个概念,不,因为没有人被强迫做任何事

耶鲁公开课 - 古希腊历史简介课程节选

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'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