According to the characteristics of design knowledge for mechanical products, the design knowledge is divided into certain knowledge and uncertain knowledge.

根据机械产品开发中的设计知识特点，将设计知识分为：确定性知识与不确定性知识。

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Knowledge can be divided into core knowledge, advanced knowledge, and innovative knowledge.

知识可以进一步划分为核心知识、先进知识和革新知识。

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From the view of creating and possessing, knowledge can be divided into private knowledge and social knowledge.

本文从生产与归属角度出发，认为知识可分为个人知识和社会知识。

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Today it is impossible to be an expert about everything, yet the medical profession do not appear to have properly sub-divided their skills into contemporary areas of knowledge for the purposes of giving evidence in the courtroom.

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