| 单词 | Archean eon |
| 释义 | Archean eon (extremely rare) n WORD FAMILY Archean eon USAGE EXAMPLESThat’s a surprise for the Archean eon, a time when Earth’s atmosphere closer to the surface seems to have been almost oxygen free. National Geographic(May 11, 2016) n the time from 3,800 million years to 2,500 million years ago; earth's crust formed; unicellular organisms are earliest forms of life Syn|Exp Archaeozoic, Archaeozoic aeon, Archean, Archean aeon, Archeozoic, Archeozoic eon aeon, eon the longest division of geological time |
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