advance guard
柯林斯词典
1. N 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
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1. N 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