rifle cannon

例句：

1. 1.The soldiers were positioned at the rifle cannon to fire on the enemy.
   士兵们被部署在步枪炮台，向敌人开火。
2. 2.The artillery team was stationed at the rifle cannon for the upcoming battle.
   炮兵队被驻扎在步枪炮台，为即将到来的战斗做准备。
3. 3.The engineers were busy repairing the rifle cannon after the battle.
   工程师们忙于战后修复步枪炮台。