如果我给你看，我认识你，不能告诉别人我跟你说的。

If I show you, then I know you, won't tell what I said.

youdao

如果我做给你看，你会相信吗？

Will you believe it if I show you?

youdao

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.

youdao