| 单词 | Silurian period |
| 释义 | Silurian period (once / 149612 pages) n WORD FAMILY Silurian period: Silurian periods USAGE EXAMPLESAbout 420 million years ago, near the end of the so-called Silurian period, the last of a series of mass extinctions struck the world’s oceans. Science Magazine(Aug 25, 2015) If this being so simple existed at the epoch which geologists term the Silurian period, it is many millions of ages past. Rameur, E., The Catholic World; Volume I, Issue...(2012) It is probable that these discoveries represent merely a small proportion of the plants actually existing in the Silurian period. Dawson, Sir J. William, The Chain of Life in Geological Tim...(2011) n from 425 million to 405 million years ago; first air-breathing animals Syn|Exp Silurian geological period, period a unit of geological time during which a system of rocks formed |
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