| 单词 | Precambrian eon |
| 释义 | Precambrian eon (extremely rare) n WORD FAMILY Precambrian eon 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 aeon, Precambrian period aeon, eon the longest division of geological time |
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