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。

youdao

Due to their low military ranks, these sailors' background information is somewhat deficient.

因为他们军阶较低，现在并未查到他们详细的背景资料。

youdao

Due to their low military ranks, these sailors' background information is somewhat deficient.

由于他们军阶较低，现在并未查到他们详细的背景资料。

youdao

During the exercises, military observers stay in the background taking notes with suggestions for improvement.

VOA: standard.2010.07.21

She has a military background, graduating from the same West Point Academy as Mr Petraeus.

BBC: CIA director David Petraeus resigns over affair

The first one had a military background, which is great and can really be an asset.

FORBES: Marie Moody: Innovative Entrepreneur Fetches Profits Chasing Dog Food

His military background, however, tells him that it can be easy for interrogators to cross the line.

CNN: Torture prompts soul-searching among some Christians