No single space project in this period will be more impressive to mankind or more important for the long range exploration of space.

VOA: special.2009.07.08

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

"Now the Long March is for an indefinite period.

VOA: standard.2009.03.15