Now, the reason why I skipped it is I'm not sure this is the best way to look at the question.

我之所以没讲是因为,我不能肯定这是考虑这个问题的最佳方式。

耶鲁公开课 - 心理学导论课程节选

so this is why I'm not, I'm not a hundred percent sure

所以我也不能确定，

关于宿舍制度 - 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

Now, that is not the most general thing, but I'm sure you guys have some idea of why we are interested in that.

这并不是最普遍的情形,但我确定你们知道我们为什么喜欢它

耶鲁公开课 - 基础物理课程节选

I'm not sure why it's not S for save but it's write out and that means save.

我也不明白为什么不用S代表“保存“而是用“写出“,“写出“也就是“保存“啦。

哈佛公开课 - 计算机科学课程节选

I'm not sure why that translation .

我并不确定如果翻译harlot一词。

耶鲁公开课 - 旧约导论课程节选