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。彩虹-4的机组在地面方舱内控制飞机。[陈博渊 / 摄]

Crew members control a CH-4 drone from a modular extendable rigid wall shelter (MERWS) during a test flight in mid-June at an undisclosed airport in northwest China. [Photo by Chen Boyuan / China.org.cn]