“Iowan glaciation”的概念、定义、翻译、参考文献-科学参考

单词	Iowan glaciation
释义	Iowan glaciation [`ī·ǝ·wǝn ´glā·sē`ā·shǝn] ^GEOLOGY The earliest substage of the Wisconsin glacial stage; occurred more than 30,000 years ago.
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