But for many of the world's poor, finding a good way to keep food cool is difficult.

VOA: special.2009.02.09

Even a man with a good job had a difficult time feeding his family.

VOA: special.2009.10.29

And it was difficult. Mainly that was because few good roads for driving existed.

VOA: special.2010.01.11

The most difficult part,she says, is creating a good design.

VOA: special.2009.05.18

General Allyn says U.N.and Haitian forces continue to have lead responsibility for security, which he says has been mostly good in very difficult circumstances.

VOA: standard.2010.01.19

And,these are occurring at a time when the global economic crisis is making it more difficult to maintain good health, especially in the developing world.

VOA: standard.2009.05.18