1. The coast was undefended and lay open to attack. 
   该海岸未设防，易受攻击。
2. Meanwhile, military satellites are completely undefended and vulnerable to attack. 
   同时，军用卫星不但易受攻击，而且对攻击毫无抵御能力。
3. Americans have a special relationship with Canadians with whom they share the world's longest undefended border. 
   美国人与加拿大人有一种特殊的关系。美加两国的边界是世界上最长的不设防边界。
4. sleepless city, ever-bright city 
   不夜城
5. A city within a city. 
   一座城中之城。

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• 1. 不设防城市
  不设防城市...不设防城市(undefended city)...所谓不设防城市即战时没有军队防御和军事设施的城市。
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