彩虹-4无人机在西北某地进行飞行训练
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彩虹-4团队人员仔细检查飞机，确保飞行训练安全、顺利进行。[陈博渊 / 摄] CH-4 crew members examine the drone's engine before a 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团队人员仔细检查飞机，确保飞行训练安全、顺利进行。[陈博渊 / 摄] CH-4 crew members examine the drone's engine before a test flight in mid-June at an undisclosed airport in northwest China. [Photo by Chen Boyuan / China.org.cn] |
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