只有很小比例的增长代表了自然原料吨位的增长—例如油、煤、矿石，木材和未加工的化学制品。
Only a small fraction of that represents growth in the tonnage of physical materials- oil, coal, ores, wood , and raw chemicals, for example.
介绍了煤基化学制品，即煤制高碳材料和高聚物单体的研究动向。
The research tendency of making coal-based chemicals, namely, the high carbon materials and monomer of aromatic polymer from coals and coal liquid are introduced.
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