那么现在，这些积分是完全不同的。

So now, well, I said these guys are completely different.

youdao

如果你还不是完全清楚，建议你去复习一下，如何建立二重积分。

OK, if that's not completely clear to you, then I encourage you to go over how we set up double integrals again.

youdao

要完全了解本课程，应必备微积分和微分方程的知识。

Calculus and Differential Equations are highly recommended for full understanding of the course.

youdao