Propulsive EDTs could thus serve as space tugs to move payloads in LEO to a higher orbit or to counteract orbital decay.是什么意思_Propulsive EDTs could thus serve as space tugs to move payloads in LEO to a higher orbit or to counteract orbital decay.在線(xiàn)翻譯_英語(yǔ)_讀音_用法_例句