Despite herself, Gina couldn't prevent a startled look from crossing her face.

I don't think it's possible to prevent individuals from crossing the border.

The new lower weight limit prevents buses from crossing the bridge.

It may also prevent the virus from crossing the placenta.

The midsection is lifted high, to prevent patients from crossing the river.

The Hamdanid army, seeing his movements, moved north as well to prevent him from crossing the river.

Israeli forces were under orders to prevent the protesters from crossing the line of control.

Federal scientists are now trying to prevent them from crossing the continental divide.

The troops did not push the onlookers away but prevented them from crossing a certain point.

A block is used to prevent a volley from crossing the net.