The scientists say the tenofovir gel was also effective against another sexually spread disease.

VOA: special.2010.07.21

One can stop spread of disease through a community without being 100% effective in each person who gets the vaccine.

疫苗能够遏制疾病在整个社区中传播,虽然对于每个人来说它并非百分之百有效

耶鲁公开课 - 生物医学工程探索课程节选

But his most effective way to spread his anti-violence message is through radio.

VOA: special.2010.08.26