advance guard
柯林斯詞典
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 前衛(wèi); 一種在主力軍行動前被派出偵查敵方防線缺漏、清除小撮反抗力量及預防敵方突發(fā)進攻的軍事部隊
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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 前衛(wèi); 一種在主力軍行動前被派出偵查敵方防線缺漏、清除小撮反抗力量及預防敵方突發(fā)進攻的軍事部隊