VOA慢速英语:Defeat Malaria, or Just Control It?; New Polio Vaccine

1.A new study estimates the possibility of ending malaria in countries that have the deadliest form of the disease.

这句话的主干是：A new study estimates the possibility，后面的of说明什么可能性。that have the deadliest form of the disease是定语从句，修饰countries。

2.Andrew Tatem, an assistant professor at the University of Florida, led the study.

assistant professor学术头衔

学术头衔中的初级职称如“助理”，我们可以用assistant来称呼。
助理教授 assistant professor
助理研究员 assistant research fellow
助理工程师 assistant engineer

3.a good health system and low levels of population movement bringing in infections from elsewhere.

bring in把…拿进来, 带进来,引进

例句：Bring him in with you.
      你把他带进来。

      The policeman brought in two boys whom he had caught stealing.
      警察把两个当场抓获的小偷带到警察局。

4.And the new study confirmed that the type two vaccine reduces the effectiveness of the other vaccines when given together.

when given

有时when引导状语从句时,在不影响文意的情况下往往将从句中某些成分省去,因此,常常会出现以下结构:

　　 When+现在分词。例如:

　　When sleeping, I never hear a thing. 睡觉时,我什么都听不见。

　　When+过去分词。例如:

　　This dictionary will look nice when printed. 这本词典印出来时会很好看。

　　When+名词或形容词。例如:

　　When a boy, he was sick all the time. 小的时候,他经常生病。

　　When+介词短语。例如:

　　When at Rome do as the Romans do. 入乡随俗。