It is wondrously clean, emitting mainly pristine steam when burned.
它出奇的洁净，燃烧时排放出基本上是新鲜的蒸汽。
Though cleaner than oil or coal, it does emit greenhouse gases when burned.
虽然，它比石油、煤更洁净，但燃烧天然气时会产生温室气体。
Pollute the lakes and streams as the metals vaporize into the air when burned.
到空气中的金属汽化燃烧时污染湖泊和河流。
Both natural gas and biogas create emissions when burned, but far less than coal and oil do.
天然气和沼气燃烧时，都会产生二氧化碳，但是要比煤和石油少得多。
But the cleanliness of natural gas is largely based on its lower carbon dioxide emissions when burned.
但是天然气的清洁特性主要是基于其在燃烧时较低的二氧化碳排放量。
When burned by a member of your own faction, you will be sent to your starting location and lose full XP.
当烧自己阵营中的一员，你将被派到你的开始位置和失去全部XP。
They also tend to produce poor-quality coal which generates relatively high levels of pollution when burned.
他们也倾向于生产劣质煤，这些煤在燃烧时产生相对高的污染水平。
This forms a combustible mixture that releases fragrant smoke when burned, and is a powerful producer of particulate matter.
这些形式的混合物在燃烧时释放芳香的烟雾，产生粉末状或颗粒样物质。
When burned, many of these mixtures have been shown to produce some of the same carcinogens that are found in cigarette smoke.
当它们燃烧时，混合物中的许多物质开始产生一些致癌物质，它们中的许多与在香烟中发现的相同。
The harmful compounds in petroleum absent from renewable diesel include benzene which becomes an airborne carcinogen when burned.
可再生柴油中不含汽油中通常含有的有害化合物，包括燃烧后在大气中生成致癌物的化学品。
Some can release harmful and poisonous things when burned, and many end up in the sea and can kill some marine animals that mistake them for food.
一些塑料袋焚烧时还会散发出有害和有毒的物质，许多塑料袋最终被弃入大海，一些海洋动物误将它们当成食物吞下，因而丧生。
This result reinforced Lavoisier's findings in 1772 when he discovered that both phosphorus and sulfur when burned increase in weight section 25.5
该结果强化了拉瓦锡在1772年的发现：那时，他发现磷和硫在燃烧中其重量是增加的（第25.5节）。
When burned, waste oil biodiesel is also generally cleaner for the air than diesel, emitting lower levels of pollutants, including particulate matter.
废油制成的生物柴油燃烧后造成的空气污染通常也比柴油要小，包括颗粒物在内的污染物的排放量更少。
A plant is said to be carbon neutral if the carbon dioxide that it absorbs while alive is the same as the carbon dioxide it emits when burned as a fuel.
据说如果植物在生长时所吸收的二氧化碳量等同于该植物被作为燃料燃烧时所释放的二氧化碳量时，那么这株植物就是碳中和了。
Humanity's main fuel for eons was wood, which has a carbon-to-hydrogen ratio of 10 to 1 when burned; by comparison, that ratio is 2 to 1 for coal and 1 to 2 for oil.
千万年以来，人类的主要燃料是木头，燃烧木头的过程中，碳和氢的比率是10比1。相比较而言，煤在燃烧过程中这个比率是2比1，而石油的比率则是1比2。
Later, the people found that the bamboo could make a crackling sound when burned. In time, the noise of crackling bamboo was replaced with bang of firecrackers.
后来，人们发现燃烧竹子能发出噼啪的爆裂声，再后来，燃放爆竹取代了燃烧竹子。
Melamine is a trimer of cyanamide. It contains 66% nitrogen (by mass) and provides fire retardant properties to resin formulas by releasing nitrogen when burned or charred.
三聚氰胺是氨腈的三聚体。它含66%的氮（质量）并在燃烧或焦化时通过释放氮气为树脂产品提供阻燃特性。
Sugars are added to produce a milder, more inhalable smoke — but also because, when burned, they generate acetaldehydes, boosting the addictive potency of the resulting smoke.
添加的糖分是为了使香烟的口感更柔和，更易吸入；同时，糖分燃烧时会生成乙醛，从而增强香烟的致瘾性。
For example, when burned in vehicles, even the most ecologically acceptable sources of ethanol create air pollution that will cause the same mortality level as when gasoline is burned.
举例来说，如果作为汽车燃料，即使最环保的乙醇，其造成的空气污染也会导致和燃烧石油同样的死亡率。
The spacecraft burned up when it re-entered the earth's atmosphere.
宇宙飞船重新进入地球大气层时烧毁了。
When the great library of Alexandria burned, the story goes, one book was saved.
据说，当亚历山大图书馆被烧毁时，有一本书得救了。
When Dad forgot about the pizza and it burned, Freddy said, "Don't worry."
爸爸把披萨给忘了，披萨烧焦了，弗雷迪说：“别担心。”
When a nearby shop burned down, our stock was ruined by smoke.
附近一家商店被烧成灰烬，我们的存货也被浓烟熏坏了。
Natalie posted information about a boy named Patrick, who lost his baseball card collection when his house burned down.
娜塔莉发布了一个名叫帕特里克的男孩的信息，他家房子被烧毁时，他丢失了自己的棒球收集卡。
The emission of sulfur dioxide when high-sulfur coal is burned is restricted by law.
高硫煤燃烧过程中的二氧化硫的排放是受到法律限制的。
They were all destroyed that year when the Capitol was burned down during America's war with Britain.
那一年，在美英战争中。国会大厦被焚毁，它们也全被毁了。
They were all destroyed that year when the Capitol was burned down during America's war with Britain.
那一年，在美英战争中。国会大厦被焚毁，它们也全被毁了。
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