Police officers say the powered parachute does have limitations.

VOA: standard.2010.01.01

The whole thing is being powered by sending heat from the hot to the cold reservoir.

所要做的所有事情,就是把热量从高温热源输送到低温热源。

麻省理工公开课 - 热力学与动力学课程节选

And so begins the first powered flight of the experimental plane designed to take man to the edge of space.

VOA: special.2010.07.07

It was not until Henry Ford's gas-powered Model T that the internal combustion engine and the car became inseparable.

VOA: special.2010.11.17

The study in Benin found that solar-powered pumps are effective in supplying water, especially during the long dry season.

VOA: special.2010.01.11

In nineteen fifty-one, Navy Admiral Hyman Rickover urged the United States Congress to provide money for the first nuclear-powered submarine.

VOA: special.2010.06.11

In nineteen sixty, Nautilus was deployed to the Mediterranean Sea to become the first nuclear-powered submarine in the United States Sixth Fleet.

VOA: special.2010.06.11

A new study in West Africa shows how farm irrigation systems powered by the sun can produce more food and money for villagers.

VOA: special.2010.01.11

made in Japan. He found it on the Internet and connected it to a bicycle-powered generator.

VOA: special.2009.12.21

The solar-powered irrigation systems produced an average of nearly two metric tons of vegetables per month.

VOA: special.2010.01.11

One day,a salesman came to the work area with a new drilling machine powered by steam.

VOA: special.2010.09.04

They were suspended from ropes as they used heavy air-powered hammers to break any loose rock away from the face of the canyon walls.

VOA: special.2009.08.12

Others are battery-powered. Experts say these devices should be placed near sleeping areas in the home.

VOA: special.2010.02.02

Students built the sugarhouse. The college farm has solar-powered barns, gardens,fruit trees, greenhouses and animals.

VOA: special.2009.04.14

They powered the Yankees to World Series wins in nineteen seventy-seven and the following year.

VOA: special.2010.07.26

All he heard was the sound of the one engine that powered his plane.

VOA: special.2009.03.18

But by nineteen seventy-nine, the world's first nuclear-powered submarine had become an old ship.

VOA: special.2010.06.11

It would have been the first biodiesel-powered car to race at Formula Three.

VOA: special.2009.11.03

Robert Corsino wants to know the history of Nautilus, the first nuclear-powered submarine.

VOA: special.2010.06.11

The band also completed building a solar-powered recording studio in two thousand eight.

VOA: special.2011.01.21

The research team helped build three solar-powered drip irrigation systems in northern Benin.

VOA: special.2010.01.11

The program also uses solar-powered weather stations to record local rainfall amounts.

VOA: special.2010.05.11

At first,the steam-powered drill worked two times faster than he did.

VOA: special.2009.02.21

And we answer a question about the first nuclear-powered submarine.

VOA: special.2010.06.11

These fuel cells powered the communications and computer systems.

VOA: special.2009.06.24

The pirates have machine guns and rocket-powered bombs.

VOA: special.2009.05.27

The lunar rover was powered by electricity.

VOA: special.2009.07.29

Then,the car automatically switches to a gas-powered engine, acting as a generator that can power through 483 more kilometers.

VOA: standard.2010.07.30

The Justice Department says powered parachutes offer a solution for rural forces that patrol large areas with limited resources.

VOA: standard.2010.01.01

Five years ago, dairy farmer Darryl Vander Haak flipped the switch on the first electric generator in Washington State powered by manure.

VOA: standard.2010.02.23