For those of you not in the know, the game is all about math skills.

对于你们那些不知情的人来说，这款游戏完全关于数学技能。

youdao

Somebody in the know told me he's going to resign.

有知情者告诉我他要辞职了。

《牛津词典》

But today, all the kids in the know use Club Penguin.

但是今天，所有的孩子都知道企鹅俱乐部。

youdao

And when the pruning is done in August, the lambs -- well, you might not want to know this part.

VOA: special.2009.07.14

We have, so to speak, inside information; " we are in the know."

我们有，可以说是，内在的信息;,我们是知道的“

哈佛公开课 - 幸福课课程节选

It's just like, we get to meet so many people that we're going to need to know in the future.

就像，我们可以见到很多将来需要认识的人。

认识更多人 - SpeakingMax英语口语达人

But, for those in the know, many incredible, older, not quiet hole-in-the-wall, food merchants still exist.

FORBES: Navigating East Hampton's Food Scene One Market at a Time

But supposedly, according to people in the know, we're talking about a real acquisition.

NPR: U.S. Auto Industry Still Reeling

I'd been told by people in the know that I had a very good chance.

BBC: Sir Ian McKellen