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元古宙
Yuángǔzhòu
pre-Cambrian (geological eon 2500-645m)
元古宙
Yuángǔ Zhòu
  1. (geology) the Proterozoic eon (part of the Precambrian supereon, spanning from 2.5 billion to 541 million years ago)
  2. the Proterozoic eon (part of the Precambrian supereon, spanning from 2.5 billion to 541 million years ago)
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