The park system includes more than three-hundred-seventy protected areas.

VOA: special.2010.01.04

The American system has three kinds of juries.

VOA: special.2009.08.31

"We will use the tremendous capabilities of this ion propulsion system to climb out of orbit around Vesta, travel for almost another three years through the asteroid belt to dwarf planet Ceres and then go into orbit around Ceres and undertake the same kind of measurements there that we'll be doing at Vesta.

VOA: special.2011.07.27

The adaptation of Charles Dickens' Little Dorrit, a co-production of the BBC and U.S.Public Broadcasting System, won three awards.

VOA: standard.2009.09.21

that 'we tried initially, during the first three years of Gorbachev's tenure, to improve the system accelerate it but keep it intact.

VOA: standard.2009.11.03

The system effectively controlled participants' blood sugar for 27 hours, during which time they ate three high-carbohydrate meals and slept through the night at a hospital.

VOA: standard.2010.04.15