常見例句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. 在由淺到深的可采深度范圍內(nèi)，存在著由低級煙煤到高級煙煤構(gòu)成的垂直分帶。 返回 Shallon