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单词 erathems
释义

era /ēˈrə/

noun
  1. A series of years reckoned from a particular point, or that point itself
  2. An important date
  3. An age
  4. A main division of geological time
ORIGIN: LL aera a number, orig counters or pieces of copper used in counting, pl of aes copper

ēˈrathem noun (geology)

The stratigraphical unit of rock strata corresponding to a geological era

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更新时间:2024/11/12 3:53:26