英语词汇“middle ordovician”的英英意思、用法、释义、翻译、读音、例句、短语、词组-英语词典-现代词典

单词	middle ordovician
释义	Middle Ordovician Middle Ordovician [′mid·əl ‚ȯr·də′vish·ən] (geology) The geologic epoch occurring between the Upper and Lower Ordovician, beginning approximately 460,000,000 years ago.
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Middle Ordovician