常見例句Scouts twenty billion miles out had detected the approach of a mighty fleet of the Outsiders.Those scouts had never come back, but their radiotronic messages had. 地球方面的載人偵查器發(fā)現(xiàn)了200億英里外正在不斷逼近的侵略者艦隊，可他們卻因此而再未返航，取而代之的是被傳回的無線電信號。radiotronn. 三極電子管(真空管) 返回 radiotronic