S Namely, you would consider a small element of a surface delta S.
即考虑曲面的面积元δ
So, s is actually this whole closed surface here.
那么，S实际上是这个完整的封闭曲面。
Let's say that we are given a parametric description — of a surface s.
比方说已知，曲面s的参数形式。
S is isometric to a surface of revolution.
与一个旋转曲面是等距对应的；
Most of the earth? S surface is covered by water.
大部分的地球表面被水覆盖着。
Most of the earth? S surface is covered by water.
大部分的地球表面被水覆盖着。
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