The inventor Henry Bessemer discovered that directing a blast of air at melted iron in a furnace would burn out the impurities that made the iron brittle.

发明家亨利·贝塞默发现，在熔炉里对铁水直接吹一吹气，就会烧掉使铁变脆的杂质。

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Factories that burn coal still polluted the air with a lot of black smoke.

烧煤的工厂仍然产生大量的黑烟污染空气。

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Wind turbines do not burn oil or coal and do not pollute the air.

风力涡轮机不烧石油和煤炭，也不会对空气产生污染。

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Race cars burn a lot of fuel, and create a lot of air pollution.

VOA: special.2009.11.03

Ingesting this slower air allows an engine to burn its fuel more efficiently while generating the same amount of thrust.

ECONOMIST: The aircraft of the future

The X-43A, or "Hyper-X" was built specifically to test scramjets, or supersonic ramjets, which burn fuel in air travelling at supersonic speeds.

BBC: Mach 10 scramjet prepares for launch

The Chinese have severe air pollution problems and they want to burn more gas, but gas is expensive, supplies are unreliable and they can't get enough of it.

FORBES: David Victor