既然已经了解到水传播的疾病能引起流行病，人们就组织好供水的工作以防止流行病的发生。

Now that the epidemics which water-borne diseases can cause are understood, water supplies are organized to prevent them.

youdao

全球防止大规模流行病传播的努力可以促进公共健康。

Global cooperation to prevent the spread of pandemic disease can promote public health.

youdao

因为没有疫苗100%保护那些接种过疫苗的小孩，但流行病学家却根据“群体免疫”确信小孩能够很好地受到保护而防止疾病的传播。

Because no vaccine protects 100 percent of kids who get it, epidemiologists rely on "herd immunity" to make sure enough kids are well enough protected to keep a disease from spreading.

youdao