21.   Recovery operations got under way almost immediately but were hampered by darkness and difficult terrain.

22.   The Envoy has a four-wheel-drive system that can be turned on and off, and a low gear range for difficult terrain.

23.   The Egyptian army recently asked for tractors that could safely go into underground munitions bunkers and be powerful enough to move over difficult terrain when they left the warehouse.

24.   The invention he is known for most recently is the iBot, a motorized wheelchair that can traverse difficult terrain like stairs and sand.

25.   The only way to get there is by foot, over difficult hilly terrain.

26.   The subject of reproductive rights has long been difficult terrain for politicians.

27.   This enables agents to compensate for the difficult terrain, she said.

28.   Those who have managed to escape to this provincial capital in southwestern Pakistan in recent days described harrowing journeys over difficult terrain.

29.   Unlike lamb and venison, which is the meat of much of Scotland, pork is favored in Orkney, because pigs can be raised on the difficult terrain.

30.   We need a moral leader to navigate the difficult terrain that encompasses moral and spiritual repair of the social fabric in urban America.