Factor Analysis and Prevention of Caving in Front of Supports at Fully Mechanized Caving Coal Face of Large Inclination Thick Coal Bed是什么意思_Factor Analysis and Prevention of Caving in Front of Supports at Fully Mechanized Caving Coal Face of Large Inclination Thick Coal Bed在線(xiàn)翻譯_英語(yǔ)_讀音_用法_例句