单词 | Proterozoic eon |
释义 | Proterozoic eon (once / 11819311 pages) n WORD FAMILY Proterozoic eon n from 2,500 to 544 million years ago; bacteria and fungi; primitive multicellular organisms Syn|Exp Proterozoic, Proterozoic aeon aeon, eon the longest division of geological time |
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