for·tress /ˈfɔrtrəs/
 城堡,要塞(vt.)築要塞,以要塞防守


 For·tress n.; pl. Fortresses   A fortified place; a large and permanent fortification, sometimes including a town; a fort; a castle; a stronghold; a place of defense or security.
 Syn: -- Fortress, Fortification, Castle, Citadel.
 Usage: A fortress is constructed for military purposes only, and is permanently garrisoned; a fortification is built to defend harbors, cities, etc.; a castle is a fortress of early times which was ordinarily a palatial dwelling; a citadel is the stronghold of a fortress or city, etc.


 For·tress, v. t. To furnish with a fortress or with fortresses; to guard; to fortify.

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 fortress
      n : a fortified defensive structure [syn: fort]