A network of sensing devices, such as satellites or radar, for detecting an enemy attack in time to take defensive or counteroffensive measures.
警戒设备，如卫星、雷达等组成的网络系统，便于及早发现敌方的进攻以采取各种防御或对抗性措施。
The troops must take all measures to strengthen the positions occupied by them, arranging trenches and other defensive works.
各部必须采取一切手段巩固阵地，挖好战壕和准备#好其它防御工事。
The troops must take all measures to strengthen the positions occupied by them, arranging trenches and other defensive works.
各部必须采取一切手段巩固阵地，挖好战壕和准备#好其它防御工事。
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