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1·She certainly knows what's what.

她当然知道轻重缓急。《牛津词典》

2·He will tell you what's what.

他会把事情的底细告诉你的。

3·Don Lino: I tell you what's what, and what?

里诺：我告诉你什么是什么，然后什么？

4·If you want to know, I will tell you what's what.

如果你想知道，我就把真相告诉你。

5·So I know what's what, because I've seen the other side.

所以我把事情看得很透，因为我可以看到事物的另一面。

6·He happened to join in the debate, so he knows what's what.

他碰巧参与这次争论，他知道事情的真相。

7·Give me a buzz and tell me as soon as you've got the what's what.

如果你弄清事情的真相就马上打电话告诉我。

8·Why do you think she will fire you when she has learnt what's what?

为何你认为她在学会业务后会解雇你？

9·When it comes to teaching youngsters to read, Nell knows what's what.

内尔完全知道该怎么教孩子们读书。

10·When you talk to David about motorbikes you can tell he knows what's what.

如果你同戴维谈论摩托车时，你能断定他很内行。