adj.含瀝青的
The destructive distillation of bituminous coal, done in the absence of air in order to obtain coke and other fractions having a greater percentage of carbon than the original material. 碳化作用煙煤的分解蒸餾，在沒有空氣的條件下進行，為得到比最初的原料所含碳的百分比大得多的焦煤以及其它餾分
What can we do with the bituminous coal? 這些煙煤可以用來做什么？
