ordovician

ordovician读音音标

英 [ˌɔ:dəˈviʃən]

美 [ˌɔrdəˈvɪʃən]

ordovician意思解释

n.

奥陶纪，奥陶系；

adj.

奥陶纪的；

英英释义

n.

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

同义词：Ordovician period

词组短语

middle ordovician

双语例句

用作名词(n.)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。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;