| 单词 | Hadean |
| 释义 | Hadean (once / 562825 pages) 1n 2adj WORD FAMILY Hadean USAGE EXAMPLESBut some geologists now favor a milder version of the Hadean, with the rain of asteroids quickly tapering off after the moon was formed. New York Times(Aug 31, 2016) The observations could also offer new insights into what Earth was like during the Hadean eon, 4– 4.6 billion years ago. Scientific American(Oct 20, 2015) These crystals provide a rare glimpse into the first chapter of Earth’s history, known as the Hadean eon. Science Magazine(Oct 19, 2015) 1 n the earliest eon in the history of the Earth from the first accretion of planetary material (around 4,600 million years ago) until the date of the oldest known rocks (about 3,800 million years ago); no evidence of life 2Syn|Exp Hadean aeon, Hadean eon, Hadean time, Priscoan, Priscoan aeon, Priscoan eon aeon, eon the longest division of geological time adj of or relating to or characteristic of Hades or Tartarus Syn Plutonian, Tartarean infernal being of the underworld |
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