The first one that I will mention is actually something you thought maybe you could do with a single integral, but it is useful very often to do it as a double integral.

第一点就是，有些你以为是用一重积分来做的，但却通常是用二重积分来完成的。

youdao

He was very drunk. He left very early the next morning. I could see that he was upset. Maybe it had something to do with a woman.

欧阳峰(旁白)：那天晚上他喝得大醉，第二天大清早就走了。但我看得出他有心事。可能跟一个女人有关系。

youdao

He was very drunk. He left very early the next morning. I could see that he was upset. Maybe it had something to do with a woman...

欧阳峰(独白)：那天晚上他喝得大醉，第二天大清早就走了。但是我看得出他有心事，可能跟一个女人有关。

youdao

I really did. I mean,sure, maybe we could do it again, but it's tough I mean the amount of money time and effort that goes into these things puts a huge strain on the city and the resources, so I hope we go for it again but I think it's hard,".

VOA: standard.2009.10.02

And I'm just wondering if you could maybe go into why it was decided to do it in this way, at this particular time.

WHITEHOUSE: White House Press Briefing: March 20,2009