Craig Willan is a flight engineer. He's closely monitored the development of electric powered aircraft.

VOA: standard.2010.08.11

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

But the very thing that drives electric powered aircraft is also the biggest hurdle.

VOA: standard.2010.08.11

With a solar powered sail and using the sun and wind to power the batteries, the purpose of the mission is to show that renewable energy works.

VOA: standard.2009.12.10

The president's second stop is at the General Motors plant that manufactures the Chevrolet Volt, an electric and gas-powered vehicle that some say might revolutionize the industry.

VOA: standard.2010.07.29

China is building hundreds of coal-powered energy plants each year.

VOA: standard.2010.08.03

Mr.Major said it is for others to judge. A high-powered inquiry into Britain's entry and involvement in the Iraq war is currently under way in London and Mr.Blair will give evidence in the coming weeks.

VOA: standard.2010.01.02