Read Edit View history 奥陶系 àotáoxì Ordovician system Origin Definitions Defs Strokes Stroke Words Sentences Sents Senses Add sense 奥陶系/ 奧陶系 àotáoxì Ordovician system Ordovician system; the layer of rock strata corresponding to the Ordovician period in geology Edit Delete References Add reference No references for this word.
奥陶系/ 奧陶系 àotáoxì Ordovician system Ordovician system; the layer of rock strata corresponding to the Ordovician period in geology Edit Delete