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坐标平面
[数] coordinate planes
- 对于任意坐标平面，都应该知道怎么做。
We'd know it for any of the coordinate planes. - 我在这里画上X-Y坐标平面，画上所有的点满足第一个方程。
And I'm drawing here the X-Y plane. And I'm gonna put, plot all the points that satisfy that first equation. - 这里使用dS而不是dA，因为我习惯把dA看成是,坐标平面中的面积元，就像在二重积分中所做的那样,待会大家会了解。
I am using dS rather than dA because I still want to think of dA as maybe the area in one of the coordinate planes like the one we had in double integrals. You will see later where this comes in.
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