pro·tag·o·nist /proˈtægənɪst/
  主演,主角,主唱者
  Pro·tag·o·nist n.  One who takes the leading part in a drama; hence, one who takes lead in some great scene, enterprise, conflict, or the like.
     Shakespeare, the protagonist on the great of modern poetry.   --De Quincey.
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  protagonist
       n 1: a person who backs a politician or a team etc.; "all their
            supporters came out for the game"; "they are friends of
            the library" [syn: supporter, champion, admirer, booster,
             friend]
       2: the principal character in a work of fiction [syn: agonist]