| 单词 | archean |
| 释义 | archean (once / 11819311 pages) adj WORD FAMILY archean USAGE EXAMPLESThe archean age, during which the brooding seems to have gone on, was probably as long as all the ages since. Burroughs, John, Time and Change(2010) adj of or relating to the earliest known rocks formed during the Precambrian Eon Syn archaean early at or near the beginning of a period of time or course of events or before the usual or expected time Archean (once / 173814 pages) n WORD FAMILY Archean USAGE EXAMPLESThe fossils date back to earth’s Archean Eon, which lasted from about 4 billion to 2.5 billion years ago. Time(Aug 31, 2016) If any hardy life did manage to succeed during that time, finding its traces in the Archean rock record seems unlikely. Science Magazine(Aug 31, 2016) That’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 aeon, Archean eon, Archeozoic, Archeozoic eon aeon, eon the longest division of geological time |
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