Makers of unmanned aircraft have seen the value of their market soar to more than $5bn in just a few years as the Pentagon and CIA increasingly rely on drones for their operations from the mountains of Afghanistan to the deserts of Yemen.
无人机制造商的市值在短短几年里激增至逾50亿美元。美国军方和中央情报局(CIA)越来越多地依靠无人机在阿富汗的山区和也门的沙漠执行任务。
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