merlon

例句：

1. 1. Themerlon on the castle wallis a symbol of protection.
   城堡墙上的护城河是保护的象征。
2. 2. The merlon was designed to prevent attackers fromclimbing up.
   这个护城河的设计是为了阻止攻击者爬上去。
3. 3. Themerlon was a popularfeature in medieval castles.
   这个护城河是中世纪城堡中一个受欢迎的特征。