a field army

例句：

1. 1. The field army was deployed to the front lines for the upcoming battle.
   野战军被部署到前线，为即将到来的战斗做准备。
2. 2. The infantry regiment marched in unison, their boots clapping on the ground.
   步兵团整齐地行进，他们的靴子在地面上发出清脆的响声。
3. 3. The field army's commander briefed the troops on the new strategy before the battle began.
   野战军指挥官在战斗开始前向部队简要介绍了新的战略。