Doctors use it to control moderate to severe pain over a long period.

VOA: special.2009.02.10

The results suggested that people do act differently if they think they are working with a group for a short period of time instead of a long period.

VOA: special.2009.03.03

So,to get a sense of what the regional moisture patterns have been, dryness and wetness over such a long period of time in great detail, I would call it a kind of victory for paleoclimate science."

VOA: special.2010.05.25

"This experiment is unique because six people will be isolated for a long period of time and will work autonomously."

VOA: standard.2010.06.02

There aren't very many examples of names which are equally popular for both boys and girls for a really long period."

VOA: special.2009.07.06