Conceptual knowledge base includes two categories of knowledge elements, i. e. subject-related concepts and semantic relations among concepts.
概念知识库包含两类知识元素：与专业领域相关的概念，概念之间的语义关系。
Knowledge into two categories, including declarative and procedural knowledge, according to contemporary learning theory of information processing.
当代信息加工学习理论把人类的知识分成两类：陈述性知识和程序性知识。
Presented knowledge model in the field of emergency can be divided into two categories.
现有的应急领域知识模型大致分为两类。
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