a type of reaction-propulsion engine to propel rockets in space; a stream of positive ions is accelerated to a high velocity by an electric field
双语例句
The spacecraft's extremely efficient ion engines will use electricity derived from solar power to ionize xenon atoms and generate a gentle but continuous thrust. 飞船极度高效的离子发动机将利用太阳能电离氙原子产生一种温和而又持久的推力发电。
