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。
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。
A network of sensing devices, such as satellites or radar, for detecting an enemy attack in time to take defensive or counteroffensive measures.
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