“Lower Ordovician”的概念、定义、翻译、参考文献-科学参考

单词	Lower Ordovician
释义	Lower Ordovician [`lō·ǝr ´ȯr·dǝ`vish·ǝn] ^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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