原史時代
  げんしじだい
  noun (common) (futsuumeishi)
  protohistory (the period between prehistory and history)
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  原子時代
  げんしじだい
  noun (common) (futsuumeishi)
  atomic age
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  原始時代
  げんしじだい
  noun (common) (futsuumeishi)
  nouns which may take the genitive case particle `no'
  primitive times
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