单词学习：crenel 建筑/军事
crenel
/ˈkrɛn(ə)l/
（城墙或堡垒上的）垛口，枪眼
The archers took their positions behind the crenels, and Teacher Gu explained the defensive advantage they provided.
弓箭手们在垛口后各就各位，顾老师解释了它们提供的防御优势。
单词卡片
卡片已就绪
