SIMPLE ANALYSIS ON THE EARTH STRESS OF MINING SLOW- DECLINING OREBODIES USING THE METHOD OF DOWNWARD HORIZONTAL LAYERING BACK- FILL MINING AND THE COUNTER- MEASURES THEREOF是什么意思_SIMPLE ANALYSIS ON THE EARTH STRESS OF MINING SLOW- DECLINING OREBODIES USING THE METHOD OF DOWNWARD HORIZONTAL LAYERING BACK- FILL MINING AND THE COUNTER- MEASURES THEREOF在线翻译_英语_读音_用法_例句