创建类别树来分类项目。

Create Category Trees to classify projects.

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使用扩展点并创建类别。

Use extension points and create the category.

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首先创建CategoryType，然后为类型创建类别。

First create CategoryType. Then create the categories for that type.

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Again we still think in terms of the basic concepts and categories ? that were created for us long ago. Okay?

但是，我们仍要思考一些基础的,概念和类别，其在很久以前,就已为我们所创建了，好吗？

耶鲁公开课 - 政治哲学导论课程节选