The Department of Homeland Security's primary function is the prevention of terrorist attacks occurring within America and, in the extreme case of an attack happening, holding losses to the smallest possible level and swiftly carrying out restoration.

The Fed is trying to stave off a run on the banks.

The damage was held to a minimum.

The gradual ruin of our country has to be stopped.

We should check the spread of the disease.

Scientists are fighting to stem the spread of the AIDS virus.

Britain's currency crisis has turned into a political one over government failure to stop the pound from going into free-fall.

Will humanity be able to prevent the degradation of ecosystems?