目前，在CRM中使用的知识发现系统很多。

Now, there are many KDD systems applied in CRM.

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最后设计知识发现系统的并举例验证了系统的正确性和实用性。

Finally, we design a knowledge discovery system and give examples to testify its validity and exactness.

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论述了一种理想化的知识发现系统模型，及其各组成部分的功能。

The model of an idealized knowledge discovery system and its several essential components are introduced.

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