Ordovician

• n. 奥陶纪；奥陶系
• adj. 奥陶纪的

英英释义

Noun:

1. from 500 million to 425 million years ago; conodonts and ostracods and algae and seaweeds

例句

用作名词 (n.)

1. This was the result from the large-scale regression in the Late Ordovician.
   这是奥陶纪晚期大规模海退的结果。
2. Major hydrocarbon source rocks are in the Cambrian and Ordovician.
   寒武-奥陶系烃源岩是该区主力烃源岩;

词汇搭配

• Lower Ordovician 早奥陶世
• Ordovician period 奥陶纪
• Upper Ordovician 晚奥陶世
• the Ordovician 奥陶纪

近反义词

【近义词】

• Ordovician period 奥陶纪