SQUADRONS of robotic machines have taken flight in recent years, ranging from unmanned aerial vehicles which patrol in Iraq and Afghanistan to experimental machines not much bigger than insects.
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雷电闪鸣使冰岛艾雅法拉火山的火山灰柱构成了一连串的脉络,它搅浑了今年春天的航空飞行。
Lightning veins the eyjafjallajokull volcano's ash plume, which roiled air travel this spring.