advance guard action前卫战斗
The Advance Guard高级保镖;先遣警卫
Tell Advance Guard讲前卫
Advance guard trut h前卫理念
advance guard support proper前队本队
advance guard support前队
Advance guard is picked army前哨精锐部队
guard against advance提前预防
N（名词） a military unit sent ahead of a main body to find gaps in enemy defences, clear away minor opposition, and prevent unexpected contact 前卫; 一种在主力军行动前被派出侦查敌方防线缺漏、清除小撮反抗力量及预防敌方突发进攻的军事部队