如果一步一步的把该做的都做了，你会知道，与C相容的法向量,是向上的。
Well, if you followed what we've done there, you know that the normal vector compatible with this choice for the curve C is the one that points up.
给你们看张图片，“相容”就是,如果我沿着C走，而且S在左边，法向量就是朝上的。
Let me show you a picture. The rule is if I walk along C with S to my left then the normal vector is pointing up for me.
为了配合约定习俗,选择相容的、指向上的法向量。
Well, to get our conventions straight, we should take the normal vector pointing up for compatibility with our choice.
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