最后，作为上述重要关系的一个简单应用，我们给出了流的正常集的另一刻划。

At last, as another simple application of the above important relation, we give another characterization for normal sets of flows.

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在第三章我们对离散系统引入了阻碍集的概念，并探讨了在此情形下的正常集的一些理论。

In the last chapter, we introduce the concept of obstruction set for diffeomorphism and obtain some results on normal sets. We do not prove these results directly.

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这对于筛选100个项左右的初始集能够正常工作，但对于大数据集将会失败。

This will work well for filtering an initial set of perhaps 100 items, but will fail on large datasets.

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