I don't know if that's true of you, but it certainly is true of people of my generation.

我不知道你们是不是也这样,但对于我们这代人来说确实如此

耶鲁公开课 - 古希腊历史简介课程节选

Yes, it's 7. So, I don't know if this is true or not, but I wonder if that's where the actual name 7-Up came from.

对，是七，我不知道这是不是真的，但是我怀疑这才是,七喜名字的真正来源。

麻省理工公开课 - 化学原理课程节选

Now,I don't actually know whether it's true that simple things can't split.

我其实不知道是否简单的东西就不能分裂。

耶鲁公开课 - 死亡课程节选

"My doctors tell me I'm going to beat this -- and I know it's true, " Roberts said.

CNN: Robin Roberts reveals MDS diagnosis

But I know it's true.

BBC: Redditch site death was 'start of nightmare'

"When I hear that, I know it's not true, " he says.

WSJ: Explaining Your Layoff to a Job Recruiter