无人机难以击落。
无人机的使用效果如何？
Police like these helicopter UAVs, soldiers less so.
警察比较喜欢这类无人直升机，军人较少些。
Might UAVs eventually replace manned combat aircraft altogether?
那么无人机是否可能完全替代人工驾驶的战斗机？
And are we ready for UAVs that can fire their weapons without human permission?
我们是否作好准备接受无人机在没有人的许可下进行武器发射？
And are we ready for UAVs that can fire their weapons without human permission?
我们是否作好准备接受无人机在没有人的许可下进行武器发射？
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