They decided instead to light them, to prevent the oil from flowing across the sand.

One of the syphons has been damaged which is preventing water from flowing through it.

Electricity through the heart can stop the rhythm, preventing the blood from flowing correctly.

She checked herself just in time to prevent the second name from flowing out of the pen.

The dams had been built to prevent water from flowing on to the defendant's land, but the state said they were a public nuisance.

This stabilises the well and prevents water from flowing into it.

These valves prevent blood from flowing back into the ventricles.

The site has been covered to prevent water from flowing over dig material.

"So why bother preventing pollution from flowing into the reservoirs in the first place?"

He considered the plot to be forced in places, as if the author were preventing the story from flowing naturally.