先学规则，即定理，运行的次序，牛顿定律-然后在章节的最后列一张问题列表。

Learn the rules first - the theorems, the order of operations, Newton's laws - then make a run at the problem list at the end of the chapter.

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最后，基于此定理，给出了选址问题的一个多项式2近似算法。

Finally, based on the theorem, a polynomial 2 approximation algorithm for the location problem is presented.

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最后，这个定理被证明是错误的。

At last, this theorem was turned out to be wrong.

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