principal force

• 主力部队

principal force的用法和样例：

例句

1. The detachment of the main force was ambushed by the enemy.
   从主力部队派遣的小分队遭到敌人的伏击。
2. They claimed that they had driven off a major force.
   他们声称已经击退了敌方的一支主力部队。