pe·ren·ni·al /pəˈrɛniəl/
 (a.)四季不斷的,繼續多年的
 pe·ren·ni·al /pəˈrɛnɪəl/ 形容詞
 多年生的,宿根的,多年生植物
 Per·en·ni·al a.
 1. Lasting or continuing through the year; as, perennial fountains.
 2. Continuing without cessation or intermission; perpetual; unceasing; never failing.
    The perennial existence of bodies corporate.   --Burke.
 3. Bot. Continuing more than two years; as, a perennial steam, or root, or plant.
 Syn: -- Perpetual; unceasing; never failing; enduring; continual; permanent; uninterrupted.
 Per·en·ni·al, n. Bot. A perennial plant; a plant which lives or continues more than two years, whether it retains its leaves in winter or not.
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 perennial
      adj 1: lasting three seasons or more; "the common buttercup is a
             popular perennial plant" [ant: annual, biennial]
      2: lasting an indefinitely long time; suggesting self-renewal;
         "perennial happiness"
      3: recurring again and again; "perennial efforts to stipulate
         the requirements" [syn: recurrent, repeated]
      n : a plant lasting for three seasons or more