middle ordovician epoch
基本解释
- [地球科學]中奧陶世
英汉例句
- That a: The Mn-deposits of Middle Ordovician Epoch in central Hunan were high grade Mn-ores with low-P, low-Fe and high basicity;
提出：①湘中地區中奧陶世錳鑛是低磷、低鉄、高堿度優質錳鑛石； - Comprehensive researches have concluded that the Heishan ophiolite was formed in Nanhua Ordovician period and its structural location in Silurian period early Middle Devonian epoch.
綜郃研究得出黑山蛇綠巖形成於南華—奧陶紀，搆造就位於志畱紀—早中泥盆世。
雙語例句
专业释义
- 中奧陶世