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ravelin中文是什么意思

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用"ravelin"造句"ravelin"怎么读"ravelin" in a sentence

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  • n.
    【筑城】半月堡。

百科解释

A 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.
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