bul·wark /ˈbʊl(ˌ)wɚ/
  壁壘,防波堤
  Bul·wark n.
  1. Fort. A rampart; a fortification; a bastion or outwork.
  2. That which secures against an enemy, or defends from attack; any means of defense or protection.
     The royal navy of England hath ever been its greatest defense, . . . the floating bulwark of our island.   --Blackstone.
  3. pl. Naut. The sides of a ship above the upper deck, usually a fencelike structure around the deck.
  Syn: -- See Rampart.
  Bul·wark, v. t. [imp. & p. p. Bulwarked p. pr. & vb. n. Bulwarking.] To fortify with, or as with, a rampart or wall; to secure by fortification; to protect.
  Of some proud city, bulwarked round and armed
  With rising towers.   --Glover.
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  bulwark
       n 1: an embankment built around a space for defensive purposes;
            "they stormed the ramparts of the city"; "they blew the
            trumpet and the walls came tumbling down" [syn: rampart,
             wall]
       2: a fence-like structure around a deck [syn: bulwarks]
       3: a protective structure of stone or concrete; extends from
          shore into the water to prevent a beach from washing away
          [syn: breakwater, groin, groyne, mole, seawall,
          jetty]
       v : defend with a bulwark