early warning system

英 美
  • 预先警报系统
  • early adv.早adj.早
  • system n.系统;体系;身体;制度
  • warning n.警告;警报;预兆adj.警告的;告诫的
Noun:
  1. a network of radar installations designed to detect enemy missiles or aircraft while there is still time to intercept them