Instead the FAA recommends - emphasis on 'recommends' - such drones be flown away from populated areas, from aeroplanes, below a certain altitude and so on.
相反，联邦航空局建议——强调“建议”——这种无人机要在一定的高度之下，远离居民区，远离机场飞行，等等。
On Wednesday, troops were holding their positions on the city's eastern border as high humidity and clouds limited visibility for drones and other aircraft.
星期三，伊军控制着摩苏尔东部地带的阵地，当天空气中的湿度非常大，云层密集，限制了无人机等飞行器的能见度。
On Wednesday, troops were holding their positions on the city's eastern border as high humidity and clouds limited visibility for drones and other aircraft.
星期三，伊军控制着摩苏尔东部地带的阵地，当天空气中的湿度非常大，云层密集，限制了无人机等飞行器的能见度。
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