The ship navigation system consists of mathematical model and knowledge model.
船舶驾驶系统既包含数学模型，也包含知识模型。
And also introduces the related theories and construction method of knowledge model.
并介绍了知识模型的相关理论和构建方法。
Knowledge representation, gain and reuse of knowledge model are introduced in detail.
详细叙述知识模型的知识表示、知识获取和知识重用方法。
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。
It is difficult to express the good knowledge relation and construct a field knowledge model.
如何表示好知识关系，构建领域知识模型，难度很大。
It is difficult to express the good knowledge relation and construct a field knowledge model.
如何表示好知识关系，构建领域知识模型，难度很大。
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