for·ti·fi·ca·tion /ˌfɔrtəfəˈkeʃən/
 防禦工事,要塞,築城


 For·ti·fi·ca·tion n.
 1. The act of fortifying; the art or science of fortifying places in order to defend them against an enemy.
 2. That which fortifies; especially, a work or works erected to defend a place against attack; a fortified place; a fortress; a fort; a castle.
 Fortification agate, Scotch pebble.
 Syn: -- Fortress; citadel; bulwark. See Fortress.

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 fortification
      n 1: defensive structure consisting of walls or mounds built
           around a stronghold to strengthen it [syn: munition]
      2: the art or science of strengthening defenses
      3: the addition of an ingredient for the purpose of enrichment
         (as the addition of alcohol to wine or the addition of
         vitamins to food)