That stands for the surface area element on this surface.
它表示曲面上的面积元素。
OK, so the first thing to do is find the area element.
第一件事就是要求出面积元。
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。
You could say this is a horizontal element typical of the area.
可以说这些墙这是该区域典型的水平元素。
Element analysis is an important research area in analytical chemistry.
元素分析是分析化学一个重要的研究内容。
Element analysis is an important research area in analytical chemistry.
元素分析是分析化学一个重要的研究内容。
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