英语词汇“gradation period”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	gradation period
释义	gradation period gradation period [grā′dā·shən ‚pir·ē·əd] (geology) The time during which the base level of the sea remains in one position. Also known as base-leveling epoch.
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