ravelin单词基本解析：

n.（城墙的）半月堡
n.三角堡,V字形棱堡
n.（城墙的）半月堡；

ravelin变化用词：

ravelin英英释义：

RavelinA ravelin is a triangular fortification or detached outwork, located in front of the innerworks of a fortress (the curtain walls and bastions). Originally called a demi-lune, after the lunette, the ravelin is placed outside a castle and opposite a fortification curtain.

以上来源于:Wikipedia

ravelin中文词源：

ravelin用法和例句：

ravelin

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