per·sis·tent /-tənt/
  (a.)固執的,堅持的,持續的
  per·sis·tent /-tənt/ 形容詞
  永存的,久存的,持續的,持久的,持久性的
  persistent
  持續
  Per·sist·ent a.
  1. Inclined to persist; having staying qualities; tenacious of position or purpose.
  2. Biol. Remaining beyond the period when parts of the same kind sometimes fall off or are absorbed; permanent; as, persistent teeth or gills; a persistent calyx; -- opposed to deciduous, and caducous.
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  persistent
       adj 1: never-ceasing; "the relentless beat of the drums" [syn: relentless,
               unrelenting]
       2: continually recurring to the mind; "haunting memories"; "the
          cathedral organ and the distant voices have a haunting
          beauty"- Claudia Cassidy [syn: haunting]
       3: retained; not shed; "persistent leaves remain attached past
          maturity"; "the persistent gills of fishes" [syn: lasting]
          [ant: caducous]