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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Our mission is to prepare engineers for success and leadership in the Conception, Design, Implementation, and Operation (CDIO) of aerospace and related complex, high-performance systems.

我们的愿景是让工程师可以带领团队，成功的进行航空工程和相关的复杂高效能系统的概念、设计、执行和运作(Conception、Design、Implementation、Operation，简称CDIO)。

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

WSJ: Tiger Woods Should Credit His Return to No. 1 on Improved Putt

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

FORBES: Wall Street's Defense Worthies