求翻译：在某一活动领域(如医学或音乐)中联系实际推演出来的概念或原理，或经过对事物的长期观察与总结，对某一事物过程中的关键因素的提取而形成的一套简化的描述事物演变过程的模型。是什么意思？

In a field of activity (such as medicine or music) deduced in practice the concept or principle, or through long-term observation of things and summary of a thing a key factor in the process of extraction and the formation of a simplified description of model of the evolution of things.

In a particular field of activity (such as medical or music) in concert with reality and to the concepts or principles, or as a result of the long-term observation and wrap things in a certain things, the key factor in the process of extraction of a simplified description of the things evolution mod

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In a certain area of activity (such as medical or music) or with practice pushes performance concept in principle, or on the long-term observation of things and summary, on key factors of an item in the process of extracting formation model of a simplified description of the evolution of things.

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