middle ordovician epoch

基本解释

• [地球科學]中奧陶世

英汉例句

雙語例句

• 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。

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专业释义

地球科學

• 中奧陶世