通过确认所有的可恢复的动作或者向前或者后退来在数据库之间维持数据的完整性。
Integrity is maintained even across databases by making sure that all the recoverable actions either go forward or go back.
维持这一姿势直到地面停止震动，确认情况安全后才能移动身体。
Hold the position until the ground stops shaking and it is safe to move.
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。
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.
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