roving artillery

例句：

1. 1. Theroving artillery was aconstant threat to the enemy's positions.
   流动的炮兵对敌人阵地构成了持续的威胁。
2. 2.The roving artillery wasable to move quickly and effectively in responseto the enemy's attacks.
   流动的炮兵能够迅速而有效地应对敌人的攻击。
3. 3. Theroving artillery was akey factor in the battle, providing supportand covering for the troops on the ground.
   流动的炮兵是战斗中的关键因素，为地面部队提供支持和掩护。