单词	circumvallation
释义	circumvallation /səːkəmvaˈleɪʃ(ə)n / noun A defensive wall of a castle or walled city: a small stream encircled the space between the inner and outer circumvallations... At the corner of the circumvallation, on the north-west, there was a fish-pond. The Athenians cut off Syracuse with two forts, and began a twin circumvallation, but left their northern walls incomplete, which proved disastrous. In its original condition a small streamlet encircled the space between the inner and outer circumvallations.
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