1. By infecting animals and letting them loose in the burrows, local epidemics of this disease could be created.
    通过让染上此病的动物在洞内乱跑，就可以使这种疾病在一个地区蔓延起来。

2. Piles of garbage and raw sewage would create epidemics, perhaps even recurrences of plague.
    一堆堆垃圾和未经处理的污物可能引起流行病，甚至会再发生瘟疫。