unpiloted

6月25日拍摄的首都机场旅客捷运系统“小火车”车厢内景。

An unpiloted vehicle shows up at the Capital International Airport in Beijing, capital of China, June 25, 2007.

Iraqi security forces were placed on high alert and American aircraft —unpiloted reconnaissance drones flying low, and fighter jets roaring high above —crossed the capital.

伊拉克安全部队处于高警戒状态，美国空在首都上空穿梭，驾驶侦察机低空飞行，战斗喷气机高空呼啸。