Read Edit View history 奥陶纪 àotáojì Ordovician Origin Definitions Defs Strokes Stroke Words Sentences Sents Senses Add sense 奥陶纪/ 奧陶紀 àotáojì Ordovician time word · Ordovician (geological period 495-440m years ago) 奥陶纪时期，海洋中出现了种类繁多的无脊椎动物。 Edit Delete References Add reference No references for this word.
奥陶纪/ 奧陶紀 àotáojì Ordovician time word · Ordovician (geological period 495-440m years ago) 奥陶纪时期，海洋中出现了种类繁多的无脊椎动物。 Edit Delete