I am sure you all know from physics class about how light moves in microscopic ways and that we can only see light when the wavelength of that light is in a specific range.

我相信，你们在物理课上都学过光是如何以微观的方式运动的，以及只有在光的波长在特定的范围内时我们才能看到光这一事实。

youdao

You have been an excellent student, Nancy, and you will not be without honors on the senior list, as I am sure you know.

南希，你一直是一名优秀的学生，你在高年级名单上不会没有荣誉，我相信你知道。

youdao

He is nothing to us, you know, and I am sure I never want to see him again.

你知道，我们一点也不把他放在心上，我的确再也不想见到他了。

youdao

"I think the Republicans, if they end up winning both and I don't know that they will I'm sure that they will crow that there is a whole new day dawning and that there has been a rejection of Obamaism and all that,".

VOA: standard.2009.10.23

In other words, only if we really are sure that the historicist act of reading is effective and works, if I know the meaning of a text. Well, fine.

换言之，要是我们确定,阅读这个历史主义行为是有效的，有用的，如果我知道文本的意思，那么，很好。

耶鲁公开课 - 文学理论导论课程节选

and just, you know, work hard and study, do your homework, eat well too, I'm sure that helps

所以，我的建议是，努力学习，认真完成作业，
同时也好好吃饭，这真的很重要哦。

如果是在考虑留学 - SpeakingMax英语口语达人

And I'm quite sure because I know Jack Dromey to be a decent and honourable person, he would have felt that was the right thing to do for him, in those circumstances, but you asked me if I was surprised that it came out, and my answer was yes, certainly.

BBC: NEWS | Programmes | Politics Show | Jon Sopel interview

As I have noted many times in this column, the GOP has a serious demographic problem and I am not sure they know how to address it sufficiently.

FORBES: The Democrats' Moment of Truth

And this CEO of a pharmaceutical company I think would know that, because I'm sure that companies and health care providers are sending that message.

WHITEHOUSE: President Obama Closes Forum on Jobs and Economic Growth