On average, only one out of every seven U.S. drone attacks in Pakistan kills a militant leader.
平均而言，美国在巴基斯坦的无人机袭击中只有七分之一击毙了激进分子头目。
When they are found by the drones, the police will warn them through the loudspeaker on the drone.
无人机发现他们时，警察可通过无人机上的扬声器对其发出警告。
I listened to the engine drone on until I fell asleep.
我一直在听发动机的嗡嗡声，直到我入睡。
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