慢速英语:In Fight Against Troubling Viruses, Vaccines Offer Hope

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短语讲解：

1. The spread of the Zika virus caused public health officials in many nations to put in place strong measures to control its spread.

put in place 实施; 实现; 做到
例句：They're offended by the elaborate security measures the police have put in place.
他们被警方部署的繁复安全措施惹怒了。

2. He says that even one child affected by zika has a very big impact on community resources and a family's ability to deal with the results.

impact on 对…冲击，碰撞，影响
例句：There will be a bigger impact on America than the civil war.
对美国将有一个比内战还要大的冲击。

3. At a time when Nigeria was thought to be almost polio-free, three children were diagnosed with the virus.

at a time 依次， 逐一， 每次
例句：Can I borrow two books at a time?
我可以一次借两本书吗？