主力部队的用法和样例：
例句
-
前哨派驻在离主力部队很远的地带的支队以防敌人的偷袭
A detachment of troops stationed at a distance from a main force to guard against surprise attacks. -
从主力部队派遣的小分队遭到敌人的伏击。
The detachment of the main force was ambushed by the enemy. -
如果我们在敌军薄弱的侧翼部署一个连队，我们就可以不动用主力部队而卷击敌军整个阵地。
If we can put a company on the enemy's weak flank, we can roll up his entire position with out engaging our main force.
