碳氢化合物(HC)像一氧化碳一样，为未燃尽的和被浪费掉的燃料。
Hydrocarbons (HC), like carbon monoxide, represent unburned and wasted fuel.
这些反应增加了不完全燃烧的可能性，更有可能释放未燃尽和光化学活性碳氢化合物到大气中。
These reactions increase the probability of incomplete combustion and are more likely to release uncombusted and photochemically active hydrocarbon compounds into the atmosphere.
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。
In a few moments the flame would flutter and go out - with still an inch of candle unburnt.
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