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他可能只是患有二重性记忆错误。
He might just suffer from Reduplicative Paramnesia.
youdao
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那么，怎么计算这个二重积分呢？
Now, how do we compute that double integral?
youdao
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如何用二重积分来表示面积呢？
How do you express the area as a double integral?
youdao
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这边是平面上普通的二重积分。
This side here is a usual double integral in the plane.
youdao
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没有必要对二重积分重新命名了。
The double integral side does not even have any kind of renaming to do.
youdao
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要懂得如何计算一个函数的二重积分。
You know how to compute a double integral of a function.
youdao
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一个是建立并计算二重积分。
One is setting up and evaluating double integrals.
youdao
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但是让我们用二重积分来做。
But let's do it as a double integral.
youdao
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这也就是二重积分的意义。
That is what a double integral means.
youdao
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这是由于我们才刚开始做二重积分的缘故。
That is because we are only doing double integrals so far.
youdao
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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.
youdao
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由于表面是二维的，所以结果是二重积分。
Because a surface is a two-dimensional object, that will end up being a double integral.
youdao
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区域R的面积是函数1在R上的二重积分。
The area R is the double integral over R of a function one.
youdao
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第二重要的地区我相信呢会是亚洲。
The second big part I am convinced will be Asia.
youdao
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来想想二重积分的其他用途吧。
Let's think about various USES of double integrals.
youdao
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先来说说关于建立二重积分的事。
So, the first topic will be setting up double integrals.
youdao
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这就是二重积分的基本定义了。
That's the basic definition.
youdao
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我们已经学过，如何建立这种二重积分的公式。
We've seen various formulas for how to set up the double integral.
youdao
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求S上zdxdy的二重积分。
We will end up with double integral on S of z dxdy.
youdao
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当然，还要学习如何去计算二重积分。
Of course, we will have to see how to compute it.
youdao
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至此我已经得到了，用来计算二重积分的所有量。
Now I have everything I need to compute my double integral.
youdao
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这也是“外部销售”的第二重意思。
This is also the second tier of "outside sales" mean.
youdao
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你愿意和我唱首二重唱吗？
Would you join me in the deut?
youdao
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总之，就是用几何方法或是在曲面上建立二重积分。
Use geometry or you need to set up for double integral of a surface.
youdao
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二重安全离合器装置能防止丝攻之折损。
Double safety unit prevents screw tap from wearing out.
youdao
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这就是二重螺旋线的形状。
That is what a double helix looks like.
youdao
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第二重：藉由指尖按摩，促进血液循环。
The second: It could promote the blood circulation by massage.
youdao
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任何事物都存在着二重性。
Any object all has dual character.
youdao
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但在大多数情况下，我们需要了解怎样建立二重积分。
But most of the time we need to learn how to set up double integrals.
youdao
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买方市场具有二重效应。
The buyers' market has double effects.
youdao