单词 | Precambrian aeon |
释义 | Precambrian aeon (extremely rare) n WORD FAMILY Precambrian aeon n the eon following the Hadean time and preceding the Phanerozoic eon; from about 3,800 million years ago until 544 million years ago Syn|Exp Precambrian, Precambrian eon, Precambrian period aeon, eon the longest division of geological time |
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