There are plentiful resources of associated sandy kaoline and soft clay in the Tertiary coal measures in Changchang coal mine area, Hainan province.是什么意思_There are plentiful resources of associated sandy kaoline and soft clay in the Tertiary coal measures in Changchang coal mine area, Hainan province.在線(xiàn)翻譯_英語(yǔ)_讀音_用法_例句