Ordovician period
美
英 
英汉解释
例句
The third period of the Paleozoic era, the Silurian follows the Ordovician period and precedes the Devonian.
志留纪是古生代的第三纪,继奥陶纪之后,在泥盆纪之前。
paleo-landform; Jurassic Period; Ordovician Period; migration of oil and gas; distribution of oil and gas;
侵蚀不整合古地貌;侏罗纪;奥陶纪;油气运移;油气分布;