"It is fortunate that you have such a strong door to keep out the water," I said.

"But he told him to close the strong door."

He led them to a stone house with a barred window in a strong door.

The strong wooden door had a single bolt, high up, which could be drawn from inside.

The children didn't know what to do, so they simply stood together and waited for the small but strong door to be opened.

We'd better find a place with a good strong door and a lock before we camp.

They came to a strong wooden door, with bolts and a lock.

But the equipment of my strong door was in order.

Those two, it seemed, were the only ones who knew the combination to the big strong door.

Only two men held keys to that strong door.