| 单词 | Precambrian eon |
| 例句 | Geologists have barely begun to describe the Precambrian eon, which spans Earth’s first 4bn years. The Anthropocene epoch: have we entered a new phase of planetary history? 2019-05-30T04:00:00Z Taken together, the geochemical and microfossil findings support his theory that during the Precambrian eon, complex life forms evolved not only in the oceans, but also on land. Death Valley's First Life Came by Land, Not by Sea 2014-04-28T20:40:00Z |
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