The other was its ability to reduce the amount of virus in the blood of people who became infected during the study.

VOA: special.2009.09.30

So I think that's really affecting my ability to study at the library.

所以我觉得这影响了我在图书馆学习的状态。

I'm frustrated 实战 - SpeakingMax英语口语达人

The other was the vaccine's ability to reduce the amount of virus in the blood of people who became infected during the study.

VOA: special.2009.10.13