Healthy skin provides a barrier between the inside of the body and the outside environment.

The former, surrounding it from three sides, provides an effective barrier.

Beyond, the road tunneled through another dark wall that provided a second barrier, should one ever be necessary.

In both cases, treatment provides a physical barrier to flame spread.

A wall is a solid structure that provides a barrier or enclosure.

The river provided a good barrier, as the bank was very steep.

The area had high clusters of rock on three sides that would provide a natural barrier against the wind.

The poor production values provided a barrier to the acceptance of the game.

A very low hedge, which bushes to provide a barrier to wind.

It was thus necessary to provide a real barrier.