Layout and support of two entries in exploitation thick seam with fully mechanized top-coal caving in longwall mining to the dip or to the rise是什么意思_Layout and support of two entries in exploitation thick seam with fully mechanized top-coal caving in longwall mining to the dip or to the rise在線(xiàn)翻譯_英語(yǔ)_讀音_用法_例句