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全盛時代.
全盛時代.
a Japanese historical period called the {"Jomon"} period
中生代.
the Mesozoic era
the Revolutionary era
the Archeozoic era
the glacial epoch
the Golden Age
the alluvial epoch
the Iron Age
始新世.
the Eocene epoch
封建時代に
封建時代に.
the stone age
the Stone Age