per·pet·u·al /pɝˈpɛʧəwəl, ʧəl; ˈpɛʧwəl/
  (a.)永久的,不斷的,沒完沒了的,四季開花的
  Per·pet·u·al a.  Neverceasing; continuing forever or for an unlimited time; unfailing; everlasting; continuous.
     Unto the kingdom of perpetual night.   --Shak.
     Perpetual feast of nectared sweets.   --Milton.
  Circle of perpetual apparition, or Circle of perpetual occultation. See under Circle.
  Perpetual calendar, a calendar so devised that it may be adjusted for any month or year.
  Perpetual curacy Ch. of Eng., a curacy in which all the tithes are appropriated, and no vicarage is endowed. --Blackstone.
  Perpetual motion. See under Motion.
  Perpetual screw. See Endless screw, under Screw.
  Syn: -- Continual; unceasing; endless; everlasting; incessant; constant; eternal. See Constant.
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  perpetual
       adj 1: continuing forever or indefinitely; "the ageless themes of
              love and revenge"; "eternal truths"; "life
              everlasting"; "hell's perpetual fires"; "the unending
              bliss of heaven" [syn: ageless, eternal, everlasting,
               unending, unceasing]
       2: uninterrupted in time and indefinitely long continuing; "the
          ceaseless thunder of surf"; "in constant pain"; "night and
          day we live with the incessant noise of the city"; "the
          never-ending search for happiness"; "the perpetual
          struggle to maintain standards in a democracy"; "man's
          unceasing warfare with drought and isolation";
          "unremitting demands of hunger" [syn: ceaseless, constant,
           incessant, never-ending, unceasing, unremitting]
       3: occurring so frequently as to seem ceaseless or
          uninterrupted; "a child's incessant questions"; "your
          perpetual (or continual) complaints" [syn: incessant, endless]