彩虹-4无人机在西北某地进行飞行训练
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彩虹-4的机组人员列队形，与无人机合影。[陈博渊 / 摄] Crew members of CH-4 drone pose for photos before the drones prior to a scheduled test flight in mid-June at an undisclosed airport in northwest China. [Photo by Chen Boyuan / China.org.cn] |
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彩虹-4的机组人员列队形，与无人机合影。[陈博渊 / 摄] Crew members of CH-4 drone pose for photos before the drones prior to a scheduled test flight in mid-June at an undisclosed airport in northwest China. [Photo by Chen Boyuan / China.org.cn] |
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