第一个和第三个可能是生物群落结构的关键因素；也就是说，所有的生物种群都生活在一起，并且它们可能在一个特定的区域内相互作用。
The first and the third can be key factors in the structure of a biological community; that is, all the populations of organisms living together and potentially interacting in a particular area.
因此，考虑疾病在相互作用种群之间传播规律的研究更具生物意义。
Therefore, it is of more biological significance to consider the effect of interacting species when we study the dynamical behaviors of epidemiological models.
种群的数量季节消长主要是繁殖和死亡两因素相互作用的结果。
Reproduction and mortality are two primary factors to affect population quantity dynamic.
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