学个词 Learn A Word:2200-drone

　　今天我们要学的词是 drone. Drone 无人驾驶飞机。The FAA issued commercial drone permits to four companies. 美国联邦航空局向四家公司颁发了使用商业无人机的许可证。与此同时，Amazon claimed its plans to develop a fleet of small drones to deliver packages are being hampered by federal regulations and threaten to take more of its research resources abroad. 亚马逊表示，他们正在研制用于送货的无人机的计划受到联邦规定的阻碍，并威胁说要把更多的研究资源转移到国外去。好的，今天我们学习的词是 drone, drone, drone...