知识库：知识库就相当于一位虚拟的“内部专家”，它提供了基于可比较的项目历史记录的默认的项目定义、赋值、范围和标准。

Knowledge bases: Knowledge bases serve as a virtual "in-house expert," providing default project definitions, values, ranges, and calibrations based on comparable project histories.

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由逻辑型的知识表示模式构造虚拟车问调度系统知识库，知识库内存放的知识以规则的形式表示。

Based on logical knowledge express model, virtual workshop scheduling system knowledge base are established, and knowledge for scheduling are expressed in rule form.

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要实现虚拟参考服务，必须建立知识库，必须利用虚拟参考产品，必须开展馆际合作。

To realize virtual reference services, we should create knowledge Banks, utilize virtual reference products, and promote interlibrary cooperation.

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