'I know the answer,' piped up a voice at the back of the room.

“我知道答案。”房间后边有个声音叫起来。

《牛津词典》

Now, I know the answer.

现在，我知道了。

youdao

Excuse me. May I know the answer?

对不起，你能把答案告诉我吗？

youdao

How could I answer the child? I do not know what it is any more than he.

VOA: special.2009.04.12

So I'm going to write that immediately here, u=0 because I know the answer to that path here.

等温过程，我们可以得到，Δ

麻省理工公开课 - 热力学与动力学课程节选

Because I know the answer, right.

结论了。

麻省理工公开课 - 热力学与动力学课程节选

And when I look out at all of you, I know the answer to that.

WHITEHOUSE: President Obama Speaks to Troops in Afghanistan

Well i know the answer to that question and i suspect you do too.

FORBES: Manchester United: where would we be without the Glazers?

Sadly, I think I know the answer to that.

BBC: Chick Young's view