Fire-fighting Practice Used in Thin Pillar of Fully-mechanized Caving Face of Coal Seam Which is Extremely Easy to Occur Spontaneous Combustion是什么意思_Fire-fighting Practice Used in Thin Pillar of Fully-mechanized Caving Face of Coal Seam Which is Extremely Easy to Occur Spontaneous Combustion在線(xiàn)翻譯_英語(yǔ)_讀音_用法_例句