| 释义 |
- n.
1 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 同义词：Hadean??/??Hadean time??/??Hadean aeon??/??Priscoan??/??Priscoan eon??/??Priscoan aeon
- 1
The history of Earth is divided into four eons —starting with the earliest, these are the Hadean, Archean, Proterozoic, and Phanerozoic. 地球的历史可分为四个时期——依次经历冥古代、太古代、元古代和显生宙。 - 2
The history of Earth is divided into four eons - starting with the earliest, these are the Hadean, Archean, Proterozoic, and Phanerozoic. 地球的历史可分为四个时期——依次经历冥古代、太古代、元古代和显生宙。
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