Studies show that the Lower Cambrian black shales in Jindingshan of Guizhou Province are sapropelic type and mixed type oil-forming rocks.是什么意思_Studies show that the Lower Cambrian black shales in Jindingshan of Guizhou Province are sapropelic type and mixed type oil-forming rocks.在線(xiàn)翻譯_英語(yǔ)_讀音_用法_例句