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.
未来（温度）上升率的不确定性很大程度上由水汽和云层‘反馈’效果造成，这些是当前研究的课题。
Uncertainties in the future rate of (temperature) rise, stemming largely from the 'feedback' effects on water vapour and clouds, are topics of current research.
IBM永远欢迎大家积极进行反馈，因此，如果您对当前实现有想法或者建议，请告知我们。
IBM is always eager for feedback, so let us know your ideas or Suggestions on the current implementation.
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