最終更新日：2024/07/28
The Ordovician period is named after the Ordovices, an ancient Celtic tribe.
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The Ordovician period is named after the Ordovices, an ancient Celtic tribe.
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The Ordovician period is named after the Ordovices, an ancient Celtic tribe.
The Ordovician period is named after the Ordovices, an ancient Celtic tribe.
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