He is intelligent, to be sure, but he's also very lazy.

他固然聪明，但也很懒。

《牛津词典》

At first, the doctors weren't sure, but she's really improved.

一开始，医生们并不确定，但她确实有所好转。

youdao

Share your thoughts with us! I'm not sure, but why would anyone do so?

和我们分享你的想法吧！我不确定，但为什么会有人这么做呢？

youdao

But Jim White made it his life's work to make sure the public would see and enjoy the cavern.

VOA: special.2009.12.07

I think they're about 17 and 5 or something like that or somewhere near that, not sure but

他们大概是17胜5负这样子，或者差不多，我不确定但

大学篮球的人气 - SpeakingMax英语口语达人

And I'm sure you don't remember, but one of the things I had in my recipe, is beat egg whites until stiff. OK.

我相信你们不记得了，但是我说过我食谱中的一件事情是，搅拌蛋清直到变浓稠，好。

麻省理工公开课 - 计算机科学及编程导论课程节选

Mr. NYHAN: We're not exactly sure but what we think is happening is people are hearing these claims.

NPR: Campaign Attack Ads Call 'Facts' Into Question

It had been an interesting year for sure but the list of things for which to be thankful is long.

FORBES: New Facebook Status Update Question Today: 'What Are You Thankful For?'

"We are out of the World Cup for sure but we hope to reach the Nations Cup finals, " Raouraoua said.

BBC: Algeria name new coach