VOA慢速英语:无运动部件的飞机首次飞行

turbine – n. large machine that produces power by using gas, steam, etc to turn a wheel

thrust – n. the pushing of something suddenly and with force

emission– n. something being released, usually into the air

electrode – n. the point where an electric current enters or leaves something such as a battery

airfoil – n. the cross-sectional shape of a wing or blade used by a propeller or turbine

volt – n. unit of measurment for the force of an electric current

concept – n. an idea or principle

efficient – adj. capable of producing desired results without wasting materials, time, or energy

battery – n. object that provides and stores electricity for things

drone – n. a kind of small aircraft that flies without a pilot