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古生代
Gǔshēngdài
Paleozoic, geological era 545-250m years ago, covering Cambrian 寒武紀, Ordovician 奧陶紀, Silurian 志留紀, Devonian 泥盆紀, Carboniferous 石炭紀, Permian 二疊紀
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)