英语词汇Ordovician Period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	Ordovician Period
释义	Ordovician Period 简明释义奥陶纪英英释义 n. 1 from 500 million to 425 million years ago; conodonts and ostracods and algae and seaweeds 同义词：Ordovician 双语例句 1 The transition between the Cambrian and the Ordovician periods is crucial in evolutionary history. 之间的寒武系和奥陶系过渡时期是在进化史上的关键。 2 The two karst developing periods for the Middle and Upper Ordovician in the Lunnan area are consistent with two transgressions of the Carboniferous. 轮南地区发育的两期岩溶与石炭纪两次较大的海侵时间相一致。
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