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The approach of Epidemical Field Research was applied.
采用现场流行病学调查方法。
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Methods:We adopted Epidemical Field Investigation method to study it.
方法：采用流行病学现场调查方法。
In this paper, a discrete stage-structured epidemical model is proposed and studied.
本文主要讨论了离散的阶段结构传染病模型。
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