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1·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。

2·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。

3·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。

4·But if we burn coal in the 21st century using 20th century technologies, our air will be foul and disruptions to our climate will threaten us all.

但是，如果我们在21世纪用20世纪的技术烧煤，我们的空气将被污染，我们的气候会被破坏，这将使所有人受到威胁。

5·In the air was the smell of burning human flesh; human beings burn surprisingly quickly.

空气中弥漫着人体烧焦的味道，人的躯体的燃烧速度快得惊人。

6·Nitrogen is removed from the air, enabling the fuel to burn in pure oxygen.

氮气从空气中被去除，使得燃料能够在纯氧中燃烧。

7·The trouble was that at high altitudes where there is less oxygen, the propeller blades had little air to bite and engines still needed oxygen to burn petrol.

麻烦的是，高海拔的地段，氧气稀薄，螺旋桨叶片没有空气使其扇动，而且发动机燃烧汽油也需要氧气。

8·Plus, cigars often burn for longer periods of time, which leads to more secondhand smoke in the air.

此外，由于雪茄比起香烟，通常会燃烧更长时间，因此会产生更多的二手烟雾。

9·Many of them burn wood, waste and dung indoors for heating and cooking. The soot released into the air as a consequence is also a climate-changer because, being dark, it absorbs heat.

很多农民通过燃烧木头、垃圾和粪便来取暖、烧饭，排放到大气中的煤烟因为是黑色而吸热同样会造成气候变化。

10·Mountain air contains less oxygen than air at lower altitudes, so breathing it causes the heart to beat faster and the body to burn more energy.

高山上的空气含氧量小于比低海拔地区，所以呼吸时心脏会跳动地更快，身体也会消耗更多能量。