彩虹-4无人机在西北某地进行飞行训练
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一架彩虹-4无人机6月中旬在我国西北某机场进行飞行训练。[陈博渊 / 摄] A CH-4 drone takes off during a test flight in mid-June at an undisclosed airport in northwest China. [Photo by Chen Boyuan / China.org.cn] |
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一架彩虹-4无人机6月中旬在我国西北某机场进行飞行训练。[陈博渊 / 摄] A CH-4 drone takes off during a test flight in mid-June at an undisclosed airport in northwest China. [Photo by Chen Boyuan / China.org.cn] |
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