攻城炮

例句：

1. 1. The army used a large cannon to attack the enemy's city.
   军队使用一门大炮攻击敌人的城市。
2. 2. The engineers were busy constructing a new cannon for the war effort.
   工程师们忙于为战争努力建造新的大炮。
3. 3. The cannon was a symbol of power and might in medieval times.
   大炮是中世纪权力和力量的象征。