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Ordovician

/ˌɔːdəvˈɪʃən/

/ˌɔːɹdəvˈɪʃən/

"ordovician" 的定义和意义

Ordovician

01

奥陶系

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

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