"There is,I think we can say with certainty, that there is not much interest, this is an overstatement.

VOA: standard.2009.11.05

Milton had begun the sentence not with calm, prophetic certainty about his divine vocation. He began it with a far more secular set of images, a set of images that comes from the world of business.

弥尔顿并不是以一种先知对他天职，的冷静确信开始写的，他以,更世俗的比喻开始,生意上的比喻。

耶鲁公开课 - 弥尔顿课程节选

And our third example touches on not when you are expressing a level of certainty,

接下来的第三个例句并不是用于表示某种程度的肯定，

I'm sure 课堂 - SpeakingMax英语口语达人

We have no idea what this menacing contraption actually is supposed to look like or what it's actually intended to signify, but we can know, I think, with some certainty that it's not scrannel.

我们无从得知这个威胁性的装置,实际上是什么样或者要代表什么，但是我们可以通过一些并不细小的确切性得知。

耶鲁公开课 - 弥尔顿课程节选

All of that means we need to explain why these folks do what they end up doing, and we have some hints, but of course we do not know with any certainty or any confidence.

综上所述,我们来想想为什么这些人,要背井离乡呢,我们有一些线索,但是我们并没有有力的证据

耶鲁公开课 - 古希腊历史简介课程节选