11.   My mother grew up in the torturous mountains of northern Syria, and my father grew up in the flat terrain of south Lebanon.

12.   Only the smallest of helicopters could land on the one tiny wedge of flat terrain.

13.   Roher said the radio can transmit and receive over a distance of about two miles over open water or flat terrain.

14.   Soon I ached for some flat terrain.

15.   Such a robot, for instance, could take the shape of a loop and roll over flat terrain.

16.   The flat terrain makes the exertion minimal, the enjoyment considerable on the one-speed bikes.

17.   The existing system works well enough over flat terrain.

18.   The flat terrain here was perfect for a slow-moving, grass-eating mammal.

19.   The Pantanal compensates for its flat terrain with the immensity of the sky and the abundance of wildlife.

20.   The structure is designed for relatively flat terrain, and the crew disagreed over the best technique for bridging the shallow valley.