low-quality anthracite

• 劣质无烟煤

low-quality anthracite的用法和样例：

例句

1. From the coal rank and the combustion characteristics and kinetic analyzing results, the stone coal should be classed as a high rank and maggy anthracite coal.
   根据煤阶和燃烧特性及动力学分析判断，石煤属于高变质的劣质无烟煤。