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ordovician /ˌɔːdəvˈɪʃən/ n

中文：奥陶纪

中文 · 奥陶纪Español · OrdovícicoFrançais · Ordovicien
Meaning：Geological period marked by the appearance of the first vertebrates and new marine invertebrates. Corals, sponges and mollusks were especially abundant.
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Origin and evolution of species Origin and evolution of species

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