在层次分析法中又引入了向量概念来解决判断矩阵不具有满意的一致性时的修正问题；

Projection pursuit (PP), improving genetic algorithm (IGA) and vector are used as a chief means of evaluating indicator and analyzing datum for the first time.

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这里我们并没有曲面定向的概念，能做的就是，从两个法向量中选出一个作为正方向。

Here we don't have a notion of orienting the surface other than by precisely choosing one of the two possible normal vectors.

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这门课我们首先学习的概念是向量，以及怎样做向量的内积。

So, the first things that we learned about in this class were vectors, and how to do dot-product of vectors.

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