Hydrocarbon generated from Middle-Lower Jurassic coal beds as the main source rock in the basin has remarkably high Pr/ph ratio as well as heavy carbon isotope and C29 sterane.是什么意思_Hydrocarbon generated from Middle-Lower Jurassic coal beds as the main source rock in the basin has remarkably high Pr/ph ratio as well as heavy carbon isotope and C29 sterane.在線(xiàn)翻譯_英語(yǔ)_讀音_用法_例句