The classification of knowledge in domains of learning is based on the scientific practice of hierarchical categorization.
学习领域知识的分类是基于科学实践层次的分类。
The belief theory of Hume was derived from his classification of knowledge, or rather from the trace of causality, and the three were interlocking.
休谟的“信念”学说源自其对知识的分类，更确切地说是源自对因果关系的追溯，三者是环环相扣的。
Social collaboration, its tool and technologies have opened up a multi-fold channel of idea exchanges, knowledge creation, classification, and searching.
社会协作、工具和技术疏通了想法交流、知识创建、分类和搜索的多种渠道。
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