In fortifying its outer barriers, it will probably destroy many before they can run far.

We want to get through the outer barrier around sunset.

Margherita does poorly at first, crashing into the outer barrier twice and oversteering the other two times.

Closing the outer barrier, The Shadow approached this new obstacle.

And he came at last to the outer barrier where the long leathery brown algae hung down into the water.

To Perry's amazement, the shade was nearly drawn; and below it showed the outer barrier.

But the airlock's large, outer barrier was once again in motion.

The outer barrier, and the invisible forcefield just inside it, were all that separated them now from the vacuum.

Feeling his way along the wall, he went toward the outer barrier.

After the break in the outer barrier beach in 1987 continued erosion threatened the structure.