| 单词 | Cambrian period |
| 释义 | Cambrian period (once / 207357 pages) n WORD FAMILY Cambrian period: Cambrian periods USAGE EXAMPLESThe 520-million-year-old fossils come from the Cambrian period, the time in Earth's history where life seems to have undergone a number of profound transitions. Scientific American(Nov 13, 2015) The beast belongs to a very early family of sea creatures called "anomalocaridids", which first appeared 520 million years ago during the Cambrian period. BBC(Mar 12, 2015) The animals in the ocean have been getting bigger, on average, since the Cambrian period - and not by chance. BBC(Feb 19, 2015) n from 544 million to about 500 million years ago; marine invertebrates Syn|Exp Cambrian geological period, period a unit of geological time during which a system of rocks formed |
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