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1. Oxford American Dictionary

   early warning system

   • n.
     a network of radar stations established at the boundary of a defended region to provide advanced warning of an aircraft or missile attack.；a condition, system, or series of procedures indicating a potential development or impending problem.

   • noun: early warning system, plural noun: early warning systems

2. • 相關詞

   distant early warning

   • n.
     a radar system in North America set up during the Cold War for the early detection of a missile ...

   Oxford American Dictionary