OK, so the first thing to do is find the area element.
第一件事就是要求出面积元。
That stands for the surface area element on this surface.
它表示曲面上的面积元素。
Well, it is just going to be the area element in a horizontal plane.
其实它是水平面的面积元素。
Well, it is just going to be the area element in a horizontal plane.
其实它是水平面的面积元素。
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