1. The rear guard of an armed force. 
   后尾部队某支军事力量的后卫部队
2. A reconnaissance or patrol unit that moves ahead of an advance party or guard, or that follows a rear guard. 
   尖兵在一群前进的士兵或卫兵前面移动的侦察或巡逻的单位，也指尾随一支殿后的卫队
3. We must dissipate their influence in relatively ineffective rear guard actions designed to prevent particular regulatory measures. 
   我们必须消除他们那种反对制订专门规章制度的枉费心机的守旧行为的影响。
4. A commissioned rank in the U.S. Navy or Coast Guard that is above commander and below rear admiral. 
   上校美军海军或海岸警备队的经过委任授予的军衔，位居海军中校之上海军少将之下
5. The soldiers on both sides of the main army body are flanks. Their task was to guard against enemy attacks and outflanking, so they face outside. And there is another array of warriors at the rear. 
   大部队西边的士兵是侧翼，他们的使命是保护大部队不受敌人的袭击和包围，所以他们脸都朝外。

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