The result is that unburned gasoline or carbon monoxide come out the tail pipe.

结果，排气尾管即排出了尚未燃烧的汽油及一氧化碳。

youdao

They are picking over the cinders in the rubbish heap for unburned pieces of coal.

他们正在检查垃圾堆中的煤渣，拣出未烧掉的煤块。

youdao

These filters reduce air pollution by minimizing the discharge of unburned carbon monoxide.

这些过滤装置将未燃烧的一氧化碳含量降至最低，降低空气污染。

youdao

An automobile has a system for releasing unburned gasoline under and behind the vehicle.

VOA: special.2010.02.02

My coffee is hot and yet my hands are unburned.

FORBES: How Starbucks Made My Friday and Taught Me About Economic Progress

Because hydrogen can clean the exhaust right from a cold engine start, the plasma reformer method is 20% to 50% more efficient at reducing NOx than other clean-diesel technologies, allowing less unburned fuel to pass through in the process.

FORBES: Clearing the Air

For now ArvinMeritor is marketing its plasma fuel reformer to the commercial trucking industry, which is scrambling to comply with tough new emission laws that are looming in Europe and the U.S. By 2007 the U.S. Environmental Protection Agency will require a 90% reduction in the amount of soot (unburned carbon).

FORBES: Clearing the Air