Law of strata and surface movement due to horizontally-sliced mechanized top-caving mining at steep-inclined super-thick coal seam是什么意思_Law of strata and surface movement due to horizontally-sliced mechanized top-caving mining at steep-inclined super-thick coal seam在線(xiàn)翻譯_英語(yǔ)_讀音_用法_例句