1. Even so, the surviving records of North America do contain references to deadly epidemics among the indigenous population. 尽管如此，现存的北美记录确实提到了土著居民中发生的致命流行病。
2. In stands dominated by trees such as aspen, however, incipient gypsy moth outbreaks are quickly suppressed by viral epidemics. 然而，在以白杨等树为主的林分，最初的舞毒蛾爆发很快就被病毒流行病所抑制。
3. The government proposes to reduce the population by using a virus that has caused devastating epidemics in rabbit populations elsewhere. 政府计划通过使用一种病毒来减少兔子的数量，这种病毒已经在其他地方的兔子种群中造成了毁灭性的流行病。
4. Virgin-soil epidemics are those in which the populations at risk have had no previous contact with the diseases that strike them and are therefore immunologically almost defenseless. 处女地流行病指的是那些风险人群以前没有接触过袭击他们的疾病，因此在免疫上几乎毫无防御能力的疾病。
5. I haven't heard of any raging epidemics among the hundreds of thousands of people buying cross border. 我还没听说过有任何传染病在数十万跨国买药的人中传播蔓延。
