英语语法分析

Unburnt vegetation rots quickly, but black carbon persists in the soil for many centuries.

未燃烧的植物腐烂得很快，但黑碳在土壤中存留了好几个世纪。

In a few moments the flame would flutter and go out - with still an inch of candle unburnt.

再过一小会儿，蜡烛的火焰就会忽明忽暗地跳动，最后完全熄灭——中间仍有一英寸未燃尽。

The studied results of behavior of unburnt pulverized coal in process of PCI in BF are summarized.

总结了高炉喷煤尤其是大量喷煤中未燃煤粉行为的研究结果。