And the large Numbers infected within a short time make pandemics disruptive, even when the virus itself is not an efficient killer.
大部分感染人群在很短时间内会使得流行性疾病发生变异，甚至病毒本身就不是一个有效杀手。
And the large Numbers infected within a short time make pandemics disruptive, even when the virus itself is not an efficient killer.
大部分感染人群在很短时间内会使得流行性疾病发生变异，甚至病毒本身就不是一个有效杀手。
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