Ravelin

[rævlin]

解释:

(n.) A detached work with two embankments which make a salient angle. It is raised before the curtain on the counterscarp of the place. Formerly called demilune, and half-moon.

整理:薇尔玛

解释:

n. a detached work with two embankments raised before the counterscarp.

编辑:韦德