Volcanic Ash in the Clay Rocks from Upper Shaximiao Formation of Middle Jurassic, Northeast of Sichuan Basin: Evidence from Petrology, Mineralogy and Geochemistry是什么意思_Volcanic Ash in the Clay Rocks from Upper Shaximiao Formation of Middle Jurassic, Northeast of Sichuan Basin: Evidence from Petrology, Mineralogy and Geochemistry在线翻译_英语_读音_用法_例句