case·mate /ˈkesˌmet/
  城牆內的炮臺,炮塔
  Case·mate n.
  1. Fort. A bombproof chamber, usually of masonry, in which cannon may be placed, to be fired through embrasures; or one capable of being used as a magazine, or for quartering troops.
  2. Arch. A hollow molding, chiefly in cornices.
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