我们事先得到敌人正在逼近的警报。
在得到敌人攻击的警告之后，印度和巴基斯坦只有三分钟的警报窗口。
India and Pakistan have only a hair-trigger three minute alert window once they get warnings of enemy attack.
每当人们发现敌人靠近时，他们就会从台上燃起狼烟作为警报。
When people found enemy troops approaching, they would send smoke signals from the tower as an alarm.
每隔一定距离，就建一个烽火台，敌人接近时，发出警报。
Beacon towers are built at certain intervals to give the alarm if enemies approach.
警报器警告人民敌人的攻击已经逼近了。
The sirens warned the people of an impending attack by the enemy.
警报器警告人民敌人的攻击已经逼近了。
The sirens warned the people of an impending attack by the enemy.
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