Their work could give infected mothers in the developing world a new way to prevent the spread of the AIDS virus to their newborn babies.

VOA: special.2010.05.24

And so there was a dispute and the pharmaceutical company sued the South African government to try to prevent their buying the cheap generic, as they saw it, pirated version of an AIDS drug.

因此这存在着纠纷,制药公司起诉了南非政府,以阻止他们购买这些低价的非专利药，在他们看来，这些都是盗版的艾滋病药。

耶鲁公开课 - 公正课程节选

She says educating people about how to prevent the transmission of the virus that causes AIDS is crucial in a country where only about 16 percent of young people say they know how to protect themselves.

VOA: standard.2009.04.24

We're at a point now where some really important recent discoveries have not answered all our questions, but have certainly helped take us into some new directions and really open up a new chapter in the search for additional options to prevent HIV Those recent discoveries include anti-bodies found in some HIV positive people that prevent the AIDS virus from entering cells.

VOA: standard.2010.07.15