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古生代
Gǔshēngdài
Paleozoic, geological era 545-250m years ago, covering Cambrian 寒武纪, Ordovician 奥陶纪, Silurian 志留纪, Devonian 泥盆纪, Carboniferous 石炭纪, Permian 二叠纪
古生代
Gǔshēng Dài
  1. (geology) the Paleozoic era (part of the Phanerozoic eon, spanning from 541 to 252.17 million years ago)
  2. the Paleozoic era (part of the Phanerozoic eon, spanning from 541 to 252.17 million years ago)