士兵们在城墙上巡逻，守卫着城堡的安全。

Soldiers patrolled along the ___ramparts, guarding the safety of the castle.

城堡的城墙又高又厚，足以抵御敌人的进攻。

The castle's ___ramparts were so tall and thick that they could withstand any attack.

古老的城墙曾是这座城市抵御入侵者的坚固屏障。

The ancient walls acted as strong ___ramparts against invaders for the city.