ordovician [ˌɔrdəˈvɪʃən]

例句:

• Cephalopods became dominant during the Ordovician period, represented by primitive nautiloids.
  来自BBC
• The Cambrian - Ordovician strata in Luxi Block are very continuous and well exposed.
  鲁西地块的寒武 - 奥陶纪地层出露连续,露头较好.
  
• Marine volcanics of Early Ordovician was found in Zhifang region.
  摘要纸房地区具有早奥陶世海相火山岩存在.
  
• This was the result from the large - scale regression in the Late Ordovician.
  这是晚奥陶世晚期大规模海退的结果.
  
• The transition between the Cambrian and the Ordovician periods is crucial in evolutionary history.
  来自BBC
• See Ordovician-Silurian extinction events.
  来自BBC