war-horse
  軍馬,有戰鬥經驗者
  warhorse
       n 1: a work of art (composition or drama) that is part of the
            standard repertory but has become hackneyed from much
            repetition
       2: an experienced person who has been through many battles;
          someone who has given long service [syn: veteran, old-timer,
           oldtimer, old hand, old stager, stager]
       3: horse used in war