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单词
middle ordovician
释义
Middle Ordovician
Middle Ordovician
[
′mid·əl ‚ȯr·də′vish·ən
]
(geology)
The geologic epoch occurring between the Upper and Lower Ordovician, beginning approximately 460,000,000 years ago.
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更新时间:2026/3/1 3:39:30