He explained the yellow fever epidemic as a providential act to discourage urban growth.

他对黄热病疫情对城市化进程的阻碍为一种巧合做出了解释。

The floods in Swat and the Indus valley are, like the yellow fever mosquitoes of the Netherlands, an indication that things could get worse.

斯瓦特和印度河流域的洪水就像荷兰的黄热病蚊子一样，是形势可能恶化的象征。

There is no cure for yellow fever.

对黄热病没有治疗方法。

What is being done about yellow fever?

正在对黄热病采取哪些行动？

Q: What is being done about yellow fever?

问: 正在对黄热病采取哪些行动？