Maybe you'd better tell me what this is all about.

也许你该告诉我，这到底是怎么一回事。

《柯林斯英汉双解大词典》

Can you tell me what this is all about?

你能告诉我这是什么意思吗？

youdao

I guess that's what this is all about: awareness.

我想这一切的关键在于：意识到问题所在。

youdao

"The crux of what this study is all about is that we define a new pathway where the brain talks to fat."

VOA: standard.2010.07.14

Of course in the central test case this is what we all care about, for the unfortunate events that befall virtuous people.

当然，这是我们归根到底都关心的一个问题，因为有德行之人也会遭遇不幸。

耶鲁公开课 - 弥尔顿课程节选

He brings it up as if we know that this is what he's been talking about all the time.

他提出这个好像我们知道一样,这是他一直在说的东西。

耶鲁公开课 - 现代诗歌课程节选

Because as Nicole said, in the end, that is really what this is all about.

WHITEHOUSE: Remarks by the First Lady at a Campaign Event

That's what this is all about, that's why I'm here today, and that's why you're here today.

CNN: Thompson's September 7, 2007, speech in Des Moines, Iowa

That's what this is all about and I think one way or another, he will get that hearing.

CNN: Senators Make Remarks After S.F.R.C. Meeting