中奧陶世 的释义 | Babel Free
ʈ͡ʂʊŋ⁵⁵ ˀɑʊ̯⁵¹ tʰɑʊ̯³⁵ ʂʐ̩⁵¹释义
the Middle Ordovician epoch (part of the Ordovician period, spanning from 470 to 458.4 million years ago)
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