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元古宙
Yuán
gǔ
zhòu
pre-Cambrian (geological eon 2500-645m)
CEDICT
Homographs
元古宙
Yuán
gǔ
Zhòu
Entry Composition
1
元古
yuán
gǔ
primeval past
2
宙
zhòu
eternity
(geology) eon