He said only this would prevent further violence.

VOA: special.2009.05.28

If you're trying to prevent a disease that only occurs at a rate of 20 per 100,000 people you have to give the vaccine to millions in order to see if the number goes down.

如果你尝试去防治一个,发病概率为十万分之二十人的疾病,那么就必须将疫苗分发给数百万人,以观察疫苗能否降低发病率

耶鲁公开课 - 生物医学工程探索课程节选

The researchers say while exercise helps prevent disease, the only way that heavier women can lose weight is to simply cut calories.

VOA: standard.2010.03.30

"The only way we can get rid of it is to tell the people how to prevent themselves and how to get rid of the disease,".

VOA: standard.2009.04.25

Yet the United Nation's children's fund says only one percent of those HIV positive mothers-to-be has access to drugs that would prevent transmission to their newborn.

VOA: standard.2009.04.24

"But still we will do our best." The four-star general also announced a unilateral cease-fire on election day, saying Afghan forces will only be on the defensive to prevent violence.

VOA: standard.2009.08.16

Not only will we do a better job of treating patients, but,we will be helping to prevent the potential spread of resistance to artemisinins, our most important class of medicines for treating malaria."

VOA: standard.2010.03.09

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

"The Temple Mount was open to Muslims that wanted to come and pray only from the age of 50 upwards, and women of all ages, This was necessary to prevent any disturbances from taking place on the Temple Mount."

VOA: standard.2009.10.05

If a woman says no,the in-laws can take her children and prevent her from inheriting anything, even if the only reason she does not want to marry her brother-in-law is to keep from infecting him with HIV.

VOA: standard.2009.10.21