Let's think about various USES of double integrals.
来想想二重积分的其他用途吧。
One is setting up and evaluating double integrals.
一个是建立并计算二重积分。
So, the first topic will be setting up double integrals.
先来说说关于建立二重积分的事。
That is because we are only doing double integrals so far.
这是由于我们才刚开始做二重积分的缘故。
But most of the time we need to learn how to set up double integrals.
但在大多数情况下，我们需要了解怎样建立二重积分。
The claim is we are able, to do double integrals in polar coordinates.
这也就说明了，可以用极坐标做二重积分。
The claim is we are able, to do double integrals in polar coordinates.
这也就说明了，可以用极坐标做二重积分。
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