英语词汇“lower 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	lower ordovician
释义	Lower Ordovician Lower Ordovician [′lō·ər ‚ȯr·də′vish·ən] (geology) The earliest epoch of the Ordovician period of geologic time, extending from about 490- to 460,000,000 years ago.
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Lower Ordovician