BACK ANALYSIS OF THE LONG- TERM TENSILE STRENGTH OF A ROCK PILLAR IN NIUCHANG ANCIENT UNDERGROUND CAVERNS IN LONGYOU COUNTY是什么意思_BACK ANALYSIS OF THE LONG- TERM TENSILE STRENGTH OF A ROCK PILLAR IN NIUCHANG ANCIENT UNDERGROUND CAVERNS IN LONGYOU COUNTY在线翻译_英语_读音_用法_例句