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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The defense wall and the deep and wide ditch surround the whole complex, not as part of a military fortification rather as a form of restricted ceremonial isolation.

防护墙和既深又宽的水渠环绕着整个建筑群，它们并不是军事防护工事的一部分，而只是一种仪式上的限制隔离。

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Experiment results indicated that the scheme has better flexibility and responds well to the request to implement complex defense strategies.

实验表明，该方案有较好的灵活性与可扩展性，能适应部署复杂防御策略的需求。

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Another senior defense official, who spoke on condition of anonymity, said last week that any change in the complex series of agreements could unravel the entire plan, which was 15 years in the making.

VOA: standard.2009.10.18

An engineer's Ebay, HelloBrain has signed up 17, 000 freelancers in 11 months, 10, 000 of them from outside the U.S. They live in 126 countries--engineers in India and Germany, code-crunchers in the Cook Islands, programmers from the old Soviet defense complex.

FORBES: Hello brain. Good-bye rules.

An engineer's Ebay, HelloBrain has signed up 17, 000 freelancers in 11 months, 10, 000 of them from outside the U.S. They hail from 126 countries--engineers in India and Germany, code-crunchers in the Cook Islands, programmers from the old Soviet defense complex.

FORBES: Hello Brain. Good-bye Rules.

Boeing will do the same in a couple of years when it moves senior defense executives into an office complex in Arlington, Virginia, near the Pentagon.

FORBES: Why Virginia's Become Mecca For Military Contractors