Archean:
The Archean Eon (/ɑrˈkiːən/, also spelled Archaean; formerly Archaeozoic /ɑrkiːəˈzoʊɪk/, also spelled Archeozoic or Archæozoic) is a geologic eon before the Proterozoic Eon, before 2.5 Ga (billion years), or .
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太古宙:
太古宙（Archean）是地质时代中的一个宙。
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Archean太古宙