de·fend·er /dɪˈfɛndɚ/
  防衛者,擁護者,辯護者
  De·fend·er n.  One who defends; one who maintains, supports, protects, or vindicates; a champion; an advocate; a vindicator.
     Provinces . . . left without their ancient and puissant defenders.   --Motley.
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  defender
       n 1: a person who cares for persons or property [syn: guardian,
             protector, shielder]
       2: a fighter who holds out against attack [syn: withstander]