Background: Deep in the bowels of Cheyenne Mountain is a city-like military complex that once served as North American Aerospace Defense Command (NORAD) 's center.

背景材料：在夏延山的深处像一座城市一样的军事综合隧道，一度作为北美防空司令部(NORAD)的中心。

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A robot digital machining system (RDMS) used to machine complex frequency selective surfaces (FSS) in the aerospace manufacturing and satellite communications is introduced in this paper.

介绍了一种在航空制造和卫星通信领域用于复杂频率选择表面加工的机器人数字化加工系统(RDMS)。

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The scientific research and production process of aerospace industry involves many dangerous harmful factors caused hazard points of various types, the amount is large and complex situation.

航天工业的科研生产过程中涉及众多危险有害因素，造成了危险点的数量大，类型多样，情况复杂的局面。

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"It's not difficult, but it's very complex, " said Dave Pelz, the former aerospace engineer turned short-game guru.

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Given the size of the military-industrial complex, there's no shortage of analysts focused on aerospace and defense companies.

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