VOA慢速英语:‘Highly Effective’ Ebola Vaccine Developed in Guinea

短语讲解：

1. Ebola is one of a number of highly dangerous viruses known as hemorrhagic fevers.

a number of 一些; 许多的
例句：A number of local personalities were present at the meeting.
一些当地名人出席了会议。

2. All of them had come into close contact with the Ebola virus.

come into contact with 接触到，和…接触，碰到;
例句：He come into contact with a lot of new idea while work abroad.
在国外工作期间他接触到许多新的思想。

3. WHO officials say early results were so promising that random tests were stopped this week so everyone at risk could receive the vaccine immediately.

at risk 有危险
例句：Were those patients now at risk?
那些病人现在是否处于危险之中呢？

4. At the same time, other people in the virus area would receive a placebo or harmless substance.

at the same time 同时
例句：At the same time he joined an association.
在同一时期，他加入了一个团体。

5. When a first Ebola case was reported in a village, researchers vaccinated everyone in contact with the sick person.

in contact with 与…在接触中
例句：Are you in contact with him now?
你现在与他有联系吗?

6. Such “rings” of vaccination took place either immediately after an Ebola infection was confirmed or three weeks later.

take place 发生
例句：Earthquakes take place far underground.
地震则发生在地球的极深处。

7. A total of 2,380 people were vaccinated three weeks later. Only 16 of them became infected with the virus.

a total of 总数为
例句：Their expenses reached a total of 1, 000 pounds.
他们的花费总计1000英镑。

8. The three countries have at least 11,279 Ebola deaths.

at least 至少
例句：For that day at least he lost heart.
至少这一天他是垂头丧气的。