A shortage of food resources in populated areas increases the likelihood of armed conflicts, famines, and epidemics, events that thus reduce population size.
人口聚集区域的食物短缺增大了武装冲突、饥荒以及人口规模缩小等事件发生的可能性。
Certain species of mosquitos are the reservoir of yellow fever virus; thus eradication of yellow fever is not feasible. This viral presence sometimes amplifies into regular epidemics.
某些种属的蚊子是黄热病病毒的贮主，因此根除黄热病并不可行。病毒活动有时增强，导致流行爆发。
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