奥陶系 àotáoxì Ordovician system Definitions Defs Origin Strokes Stroke Words Sentences Sents 奥陶系 奧陶系 àotáoxì Ordovician system Ordovician system; the layer of rock strata corresponding to the Ordovician period in geology Frequency Written text 0.167 per million Sources Frequency data BCC Corpus (BLCU)
奥陶系 奧陶系 àotáoxì Ordovician system Ordovician system; the layer of rock strata corresponding to the Ordovician period in geology Frequency Written text 0.167 per million Sources Frequency data BCC Corpus (BLCU)
