导航知识通过知识获取机构存入知识库，由知识管理工具维护。
The navigation knowledge was stored in knowledge base through knowledge acquisition department and maintained by knowledge management tools.
通过系统维护模块，系统管理员可对系统知识库进行编辑、更新和扩充，从而实现改善和提高系统性能的目的。
Subsystem for system maintenance: it could be used to update and expand in the system, and improve its function.
知识库、实例库管理的研究主要是知识和实例的浏览、查询、添加、修改和维护。
The studys of management of the knowledge base system and case base system aim at browse, search, add, amend and maintenance.
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