圆盾

例句：

1. 1. The knight wore a round shield to protect himself from the enemy's attacks.
   骑士戴着一个圆形盾牌来保护自己免受敌人的攻击。
2. 2. The soldiers used round shields to defend themselves against the enemy's assaults.
   士兵们使用圆形盾牌来抵御敌人的进攻。
3. 3. In medieval times, round shields were commonly used as weapons for battles.
   在中世纪，圆形盾牌常被用作战斗武器。