悠久 [ㄧㄡ ㄐㄧㄡˇ; you1 jiu3]
  long (tradition, history etc)
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  悠久
  ゆうきゅう
  adjectival nouns or quasi-adjectives (keiyodoshi)
  nouns which may take the genitive case particle `no'
  noun (common) (futsuumeishi)
  eternity
  perpetuity
  permanence
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