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Weekly observation in a wheat field might give the following observations on stem rust during the course of an epidemic . 在秆锈病的流行过程中，每周在小麦田中进行观测，得到如下结果。
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The popular process of contagion is by infect a source to transmit way and easy feeling crowd 3 link form 传染病的流行过程是由传染源传播途径和易感人群三个环节构成的。
