On the basis of hitches and coal texture characteristics developed in No. 3 coal seam, the author divided the minefield into 4 structural subregions.是什么意思_On the basis of hitches and coal texture characteristics developed in No. 3 coal seam, the author divided the minefield into 4 structural subregions.在線(xiàn)翻譯_英語(yǔ)_讀音_用法_例句