Read Edit View history 奥陶纪 àotáojì Ordovician Origin Definitions Defs Strokes Stroke Words Sentences Sents created sense approved 奥陶纪/奧陶紀 · àotáojì · Ordovician 2026/03/04 奥陶纪 / 奧陶紀 àotáojì Ordovician 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。 time word created sense Mar 4, 2026, 02:25 AM