un·seen /ˌʌnˈsin/
  (a.)未見過的,看不見的
  Un·seen a.
  1. Not seen or discovered.
  2. Unskilled; inexperienced. [Obs.]
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  unseen
       adj 1: not seen or perceived; "unseen natural resources"
       2: not observed [syn: unobserved]
       n : a belief that there is a realm controlled by a divine spirit
           [syn: spiritual world]