攻城加农炮

例句：

1. 1. The city's defense system relies heavily on its cannons for defense.
   城市的防御系统严重依赖于其火炮进行防御。
2. 2. The ancient Chinese army used to use cannons to conquer their enemies.
   古代中国军队过去使用火炮征服他们的敌人。
3. 3. The artillery team fired a series of cannons at the enemy position.
   炮兵队向敌方阵地发射了一系列火炮。