He finally was set down on a cold, hard surface, unable to move.

We run out of hard surface in less than a minute.

As nothing happened, he put out his hand, and felt a cold, hard surface.

He will never be able to sit on a hard surface again.

More generally, any hard surface can act as a sound board.

All three hit the hard surface and covered their heads.

Not everybody could stand lying still on a hard surface for long.

For a time, he lay on the hard surface before opening his eyes.

He was looking at the hard surface of the rock.

Be sure to throw it with some force against a hard surface.