metabituminous coal

• 高煤化无烟煤,超烟煤

metabituminous coal的用法和样例：

例句

1. What can we do with the bituminous coal?
   这些烟煤可以用来做什么？
2. Soft coal burns with more flames than hard coal.
   烟煤燃烧时火焰较无烟煤多。