I want him back, but I just don't know how to go about it.

我希望他回来，可我就是不知道怎么去做这件事。

《柯林斯英汉双解大词典》

Of course I wouldn't know anything about that: I just read it in a book.

当然我无法知道关于这点的一切：我只是从一本书中读到的。

youdao

STEVEN: It doesn't. I just want to know about your experience.

史蒂文： 剧中不要求会唱歌， 我只是想了解你的经历。

youdao

I was kind of skeptical because, you know, you just hear about how bad it is and how sketchy but,

我有点怀疑，因为你知道，总是能听说交通多么不完善，

利用大众交通工具吧 - SpeakingMax英语口语达人

I'm using it just to make the point, which you already know about; that the nervous system is complex in it performs a complex set of functions.

我想通过这张图片阐述一些,你们已经知道的知识,即神经系统是一个,功能复杂的复合体

耶鲁公开课 - 生物医学工程探索课程节选

So it might look like here, if you don't understand about p orbitals, which I know all you do, but if someone else was just looking and seeing, it kind of looks like there's two bonds here.

这里看起来有点像，如果你们不知道p轨道的话，我知道你们都知道，但如果另外有个人看到这个，这看起来有点像两个键。

麻省理工公开课 - 化学原理课程节选

One interpretation is that I just have no idea know what I am talking about and it is always important to keep that possibility in mind.

FORBES: Housing in 2013

When people laughed at me, I didn't know, 'Should I keep going or should I just forget about it or do as everybody else does?

NPR: Singer Brings a Modern Sound to Chinese Jazz

And I'm just - I was - you know, it makes sense hearing your guest talk about his behavior.

NPR: Electronics Pioneer William Shockley's Legacy