慢速英语:New Vaccine Shrinks Head and Neck Cancers

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短语讲解：

1. Today, we tell about a new vaccine for fighting cancers in the head and neck.

tell about 谈及；讲述
例句：What would he tell about now?
他现在会说些什么？

2. And we report on evidence suggesting that being able to speak two languages is good for the brain as we age.

be able to  能，会；能够；克
例句：We'll be able to smooth away these difficulties.
我们能够克服这些困难。

3. But the natural defenses are often too weak to prevent the cells from spreading.

prevent from 阻止， 防止
例句：The bad weather prevent from the military action.
坏天气妨碍了军事行动。

4. Researchers say it is important for donors to continue to provide money for treatment.

continue to 继续
例句：Let me continue to revel in those memories!
让我继续沉醉在这些回忆中吧！

5. But he says the older bilingual adults appear to have built up a kind of surplus from a lifetime of increased mental activity.

built up 建立
例句：Mr. wilson has built up his own business.
威尔逊先生建立起了自己的事业。