Martz chuckled and left a natural opening for a question.

From the sea, those windows look like natural openings in the rocks, so you have nothing to worry about there either.

I'll bring the subject up later, when we're all at home, when there's a natural opening in the conversation.

They entered the hill by a natural opening under a huge rock, where a little stream rushed out.

Here was a natural opening, and I took it.

An overcall of a natural opening at the one level does not promise 4 cards in a known suit.

It was an old ancestor tunnel rather than a natural opening.

You concentrate on sliding your body through the natural openings.

Using a strong club system, Lasocki opened two clubs, a natural opening.