英语词汇Cretaceous-Tertiary boundary怎么读，是什么意思，单词翻译、读音、固定搭配用法和短语词组及例句-英汉双解词典

单词	Cretaceous-Tertiary boundary
释义	Cretaceous-Tertiary boundary 【地】白垩纪-第三纪交界 (约6500万年前)
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