Analysis of Effect of Grouting of Separated Zone on Reduction of Surface Subsidence in Using Wide-strip Partial Extraction Method at Tianchen Coal Mine是什么意思_Analysis of Effect of Grouting of Separated Zone on Reduction of Surface Subsidence in Using Wide-strip Partial Extraction Method at Tianchen Coal Mine在線(xiàn)翻譯_英語(yǔ)_讀音_用法_例句