我们从电影里曾见过这样的情景:山顶上的少年发现了敌人,于是马上推倒身边的小树,而村民们看到后,就迅速隐蔽起来。这就是原始的警报或称为早期告警。据记载,早在1000多年前,古代的中国人民就已采用烽火作为警报传递敌情了。在高技术军事装备迅速发展的今天,作战区域早巳从地面扩展到海上和空中,呈立体形式。高速飞行的战斗机可在几分钟内跨越百公里以上的距离,而战区的范围也扩大到方圆数百公里。 We have seen scenes from the movie where the juvenile on top of the hill found the enemy and immediately pushed down the small tree beside him, and the villagers quickly concealed them when they saw it. This is the original alarm or early warning. According to records, as early as more than 1,000 years ago, the ancient Chinese people had used flames as an alarm to deliver their enemy’s feelings. Nowadays, with the rapid development of high-tech military equipment, the combat zone has already expanded from the ground to the sea and the sky, in three dimensions. High-speed flying fighters can cross more than a hundred kilometers in just a few minutes, and the theater’s reach has expanded to hundreds of kilometers.