Within the range of workable deepness from the shallon to the bottom,there existed a verticalzonation of bituminous coal from low rank to high rank.是什么意思_Within the range of workable deepness from the shallon to the bottom,there existed a verticalzonation of bituminous coal from low rank to high rank.在線(xiàn)翻譯_英語(yǔ)_讀音_用法_例句