以此为目的，基本的想法是创建一个用户定义组合函数，此函数首先调用模型创建过程，之后再提取规则并将这些规则作为结果集返回。

In order to do this, the basic idea is to create a combined user-defined function that first invokes the model creation process and that then extracts the rules and returns them as a result set.

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再提取图像的边缘特征。

Then, the image edge features were extracted.

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研究人员选取两个植物种群，分开培育它们，再提取DNA分析分子标记。

The researchers developed two populations of plants, grew them in separate locations, and extracted DNA to analyze molecular markers.

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