ravelin
导读：ravelin读音音标
英 [\'rævlɪn]美 [\'rævlɪn]
ravelin意思解释
n.（城墙的）半月堡； 英英释义 RavelinA ravelin is a triangular fortification or detached outwork, locat
英 [\'rævlɪn]美 [\'rævlɪn]
ravelin意思解释
n.（城墙的）半月堡； 英英释义 RavelinA ravelin is a triangular fortification or detached outwork, locat
ravelin读音音标
英 [\'rævlɪn]
美 [\'rævlɪn]
ravelin意思解释
n.
（城墙的）半月堡；
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.
