The project also works to prevent languages from dying out by identifying the most threatened areas where languages are disappearing.

VOA: special.2009.12.02

One was the ability of the vaccine to prevent infections from the human immunodeficiency virus, better known as H.I.V.

VOA: special.2009.10.13

The agreement sets targets to prevent the Earth's average temperature from rising more than two degrees Celsius above pre-industrial levels.

VOA: special.2009.12.26

He wanted to prevent the South from shipping its agricultural products to other countries in exchange for industrial goods.

VOA: special.2009.09.10

One Confederate officer, trying to prevent his troops from moving back, pointed to a group led by General T.J.Jackson of Virginia.

VOA: special.2009.08.27

It is usually much better to prevent a problem from happening than it is to find ways to solve it.

VOA: special.2009.08.30

A doctor examined Brown. He reported that Brown's wounds were not serious enough to prevent the trial from starting.

VOA: special.2009.07.02

Twenty-one nations around the world recently joined forces to better understand and prevent greenhouse gas emissions from farms.

VOA: special.2010.01.05

But he also said the government must be willing to spend extra money to prevent people from starving.

VOA: special.2011.03.10

The Union commander,General Hooker, had to keep his army between Lee and Washington to prevent the Confederates from seizing the national capital.

VOA: special.2009.10.22

For example, you can add sand to prevent tiny breaks or lines from forming in the finished product.

VOA: special.2009.09.14

The volunteers placed the plants about five centimeters into the soil to prevent rising and falling water levels from pulling them out.

VOA: special.2009.10.06

The fluoride mixes with enamel, the hard surface on teeth, to help prevent holes, or cavities,from forming.

VOA: special.2009.03.11

One of Palmer's first actions as Attorney General was to prevent coal miners from going on strike.

VOA: special.2010.12.09

For example,natural chemicals from black pepper and the Indian spice turmeric might help to prevent breast cancer.

VOA: special.2010.06.01

It was ordered to put pressure on Johnston's force to prevent it from helping Beauregard.

VOA: special.2009.08.27

To be successful, they had to prevent the government from selling gold on the market.

VOA: special.2010.02.18

They said they would fight, if necessary, to prevent the Republicans from stealing the presidency.

VOA: special.2010.03.04

He also wanted to prevent the soldiers in Jackson from joining the soldiers in Vicksburg.

VOA: special.2009.11.19

Fox said a few warships could be sent to prevent southern gunboats from interfering.

VOA: special.2009.08.06