VOA常速英语:Helper Serum Boosts Effectiveness of Flu Vaccine

短语讲解：

1. Vaccines against swine and avian flu can be made more effective by the addition of a helper serum known as an adjuvant. 

known as以…知名；被认为是
例句：This is known as reverberation.
这个现象被成为回响。

2. Vaccines are based on an antigen - the ingredient that actually stimulates the body's immune response - plus other components.

be based on根据，以…为基础
例句：These friendships are based on common interests.
这些友谊都是基于共同的兴趣。
immune response免疫反应

3. A new study looked at the effectiveness of one of those other components - an adjuvant called MF59 - in boosting some flu vaccines.

look at看, 注视; 评判; 审视
例句：The difficulty can now be looked at in a different light.
现在可以用不同的角度来看这个困难。

4. "This type of adjuvant works by attracting to the site of vaccination competent immune cells, whereby they're creating a local environment to facilitate the immune response."

attract to吸引〔诱惑〕…至
例句：It attracted many visitors to the place.
它招引了许多来客到这地方。

5. In a study published in the journal Science Translational Medicine, Golding and her colleagues showed that adding MF59 to vaccines for H1N1 swine flu and for avian flu increased the immune response in various age groups.

add to增加, 加强
例句：That will only add to our difficulties. 
那只会增加我们的困难。 

6. If you have more efficient processing of a certain amount of vaccine, you don't need as much to get the same level of immune response.

a certain amount of一定数量的
例句：A ship displaces a certain amount of water .
一艘船排除某一定量的水。