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.
無人機製造商的市值在短短几年裏激增至逾50億美元。美國軍方和中央情報局(CIA)越來越多地依靠無人機在阿富汗的山區和葉門的沙漠執行任務。
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