“Lower Silurian”的概念、定义、翻译、参考文献-科学参考

单词	Lower Silurian
释义	Lower Silurian [`lō·ǝr sǝ`lu̇r·ē·ǝn] ^GEOLOGY The earliest epoch of the Silurian period of geologic time, beginning about 420,000,000 years ago.
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