1.3.4模型属性（Model Attribute）和属性提升（Attribute Promotion） 1.3.5衍生模型（Derived Models） 有的时候，我们想只改变一个model的一些attributes就可以得到一个新的model。这种机制称为模型的衍生（model derivation）。
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Patient-Derived Xenograft Models 病人来源肿瘤异种移植模型
The derived models target the needs of the process, service, and data domains with process, UML service, and er models respectively.
由此派生的模型分别通过过程、UML服务和ER模型满足过程、服务和数据域的需求。
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They were run by brilliant quantitative economists, with models derived from statistics dating back decades.
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The weights of the individual wolves were estimated based upon models derived from body-mass measurements taken concurrently from 304 wolves, including 86 of the 94 wolves in the study.
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The Maserati series cars are derived from production models.
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