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英日字典: ordovician_period

ordovician period   (TTS Sound)


The ordovician_period has 1 Senses.

  • ordovician period, ordovician
  • オルドビス紀
  • from 500 million to 425 million years ago; conodonts and ostracods and algae and seaweeds
  • 5億年前から4億2千5百万年前まで

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