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

单词	upper ordovician
释义	Upper Ordovician Upper Ordovician [′əp·ər ‚ȯr·də′vish·ən] (geology) The latest epoch of the Ordovician period of geologic time, beginning approximately 440 million years ago.
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Upper Ordovician