The accuracy of a knowledge base can be maintained and improved over time by providing it with feedback -- confirmation or correction of the current categorization.
通过向知识库提供反馈（对当前的分类进行确认或纠正），知识库的精确性可以随着时间的推移得以维持和提高。
Methods: In the classroom, the feedback and correction methods of comparison of correct and error, complementation, and mimesis were used.
方法：在实验教学中运用正误对比、互补、模仿等反馈与矫正法。
From the linearization procedure, a new approach of system identification that is on-line real time modeling and real time feedback control correction can be found.
但研究发现，在这种线性化过程中，包含了一种新的系统辨识思想，那就是在线实时建模一实时反馈控制校正的思想。
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