ground alert

• 1. 戒备状态: DEFCON | defense readiness condition | state of readiness
• 2. 处于高级戒备状态: on high alert
• 3. 美军戒备状态: military alert level Delta

• 1.她整个人保持着戒备状态。
  Her whole bearing was alert.
  dict.yoduao.com
• 2.5 000多名士兵已处于（全面）戒备状态。
  More than 5 000 troops have been placed on (full) alert.
  dict.yoduao.com
• 3.敌军显示出进攻的迹象，部队不得不进入戒备状态。
  Warnings of an enemy attack forced the troops onto the defensive.
  dict.yoduao.com

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