The preliminary research of the variational Characteristics of water content in the section of the weathered coal gobs on coal gob mountains in YangQuan city是什么意思_The preliminary research of the variational Characteristics of water content in the section of the weathered coal gobs on coal gob mountains in YangQuan city在線(xiàn)翻譯_英語(yǔ)_讀音_用法_例句