短語詞組短語first coal mining face 首採工作麪conventional coal mining face 普採工作麪coal working face 煤工作麪thin coal seam face 薄煤層工作麪Mechanized Coal Winning Face 機械化工作麪mining coal work face 高檔工作麪coal caving face 放頂煤工作麪coal -face work 採煤工 返回 coal face