I mean, who really knows?

我是说，谁真的知道呢？

youdao

Do you know someone who really knows how to enjoy every moment?

你认识的人中谁最懂得享受每一分每一秒的？

youdao

You know he's the only one on your team who really knows what's going on .

要知道，它是你们队里唯一知道自己该干什么的球员。

youdao

That means the song is so old, no one really knows who wrote it.

VOA: special.2009.07.27

Moreover, who really knows what anyone might have done in 1999 (Nextag) or 2004 (Yelp)?

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The only one who really knows is Mark Roy Anderson, 53, the majority shareholder of both of these publicly traded (Bulletin Board) companies, through his Camden Holdings of Beverly Hills, Calif.

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