THE TECHNIQUE OF GOB-SIDE ENTRY RETAINING WITH ENTRY-IN PACKING ON ITS ORIGINAL POSITION IN FULLY-MECHANIZED COALFACE WITH TOP-COAL CAVING是什么意思_THE TECHNIQUE OF GOB-SIDE ENTRY RETAINING WITH ENTRY-IN PACKING ON ITS ORIGINAL POSITION IN FULLY-MECHANIZED COALFACE WITH TOP-COAL CAVING在線(xiàn)翻譯_英語(yǔ)_讀音_用法_例句