| 单词 | Proterozoic aeon |
| 释义 | Proterozoic aeon (extremely rare) n WORD FAMILY Proterozoic aeon n from 2,500 to 544 million years ago; bacteria and fungi; primitive multicellular organisms Syn|Exp Proterozoic, Proterozoic eon aeon, eon the longest division of geological time |
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