unmanned air vehicle

• 无人机

unmanned air vehicle的用法和样例：

例句

1. The Air Force doesn't exactly want its drones powered bypurple bacteria.
   空军不是真的想用紫细菌来驱动无人机。
2. Even in war zones, the American air force is starting to worry about the danger of aircraft colliding with smaller UAVs.
   甚至在战争区域，美国空军也开始担心普通战机会与稍小的无人机相撞。