甲烷和丙烷是烷烃。
另一种与农业扩张有关的气体是甲烷。
Another gas associated with the spread of agriculture is methane.
燃烧甲烷产生二氧化碳，然后释放到大气中。
The burning of methane generates carbon dioxide that is released into the atmosphere.
围绕海王星的气层内所含大量甲烷将它染成了蓝色。
The large amount of methane contained in the atmosphere surrounding Neptune stained it blue.
动物打嗝、放屁时会产生另一种危险的温室气体甲烷。
Animals produce methane, which is another dangerous greenhouse gas when they burp and fart.
据估计，释放到大气中的甲烷有25%来自农场动物。
It is estimated that 25% of all methane that released into the atmosphere came from farm animals.
早期的农民开始砍伐森林，牲畜产生了大量额外的甲烷。
Early farmers started clearing forests and livestock produced a lot of extra methane.
因此，现在从露天垃圾填埋场排放的甲烷应该被用来发电。
Therefore, the methane now emitted from open landfills should instead be burned to produce electricity.
许多环境专家现在认为，甲烷比二氧化碳对全球变暖负有更大的责任。
Many environmental experts now believe that methane is more responsible for global warming than carbon dioxide.
木星的行星有非常厚的大气层，且由不同数量的氢、氦、甲烷和氨等元素组成。
The Jovian planets have very thick atmospheres consisting of varying amounts of hydrogen, helium, methane, and ammonia.
这项最新发现将帮助天文学家在寻找外星生命过程中辨别两种来源不同的甲烷。
The latest research will help astronomers distinguish between the two sources of methane in their search for extraterrestrial life.
它的峰值，就是在间冰期刚开始，大气中有最多的二氧化碳和甲烷气体，温室气体。
Its peak, that is, there is the most carbon dioxide and methane gas, greenhouse gases in the atmosphere just after the beginning of the interglacial period.
例如，在倒数第二个冰期的高峰和接下来的间冰期之间，甲烷浓度几乎增加了一倍。
The methane concentration nearly doubled, for example, between the peak of the penultimate glacial period and the following interglacial period.
来自Vostok 地核的其他数据显示，甲烷气体也与温度和二氧化碳密切相关。
Other data from the Vostok core show that methane gas also correlates closely with temperature and carbon dioxide.
因此，一些科学家推断，地球早期的大气与现在的不一样，主要由氢、甲烷和氨构成。
Therefore some scientists postulate that the Earth's earliest atmosphere, unlike that of today, was dominated by hydrogen, methane, and ammonia.
此外，河流筑坝等工程也增加了沉积物的产量，更不用说大气中二氧化碳和甲烷的增加。
Also, things like the damming of rivers has caused increased sediment production, not to mention the addition of more carbon dioxide and methane in the atmosphere.
在地球最早的大气层中，甲烷和二氧化碳的含量比现在要高得多，这对早期生命来说是有利的。
In Earth's earliest atmosphere, methane and carbon dioxide occurred at much higher levels than at present-a circumstance that was favorable for early life.
昆虫产生的氨比猪和家禽少，它们产生的甲烷比家畜少十倍，而产生的一氧化二氮比家畜少三百倍。
Insects produce less ammonia than pig and poultry farming, ten times less methane than livestock, and 300 times less nitrous oxide.
在远离太阳的外太阳系，在木星轨道之外，温度低到足以使冰从水以及甲烷和二氧化碳等气体中形成。
Far from the sun, in the outer solar system, beyond Jupiter's orbit, temperatures are low enough to permit ices to form out of water and out of gases like methane and carbon dioxide.
现在，我们已经研究过几个间冰期的典型模式，其中一种是大气中二氧化碳和甲烷含量达到峰值的情况。
Now, the typical pattern for an interglacial period—and we've studied several—is that the concentration of carbon dioxide and methane gas actually reaches its peak.
首先，所有的动物，如牛、猪和羊，总是排出石灰甲烷气体，这是继二氧化碳之后第二常见的温室气体。
For a start, all animals, such as cows, pigs and sheep, always gas limed methane, which is the second most common green house gas after carbon dioxide.
如果大气中的甲烷和二氧化碳像地球最早期的大气那样丰富，那么地球的温度对今天生活的大多数物种来说可能太热了。
If atmospheric methane and carbon dioxide were as abundant now as they were in Earth's earliest atmosphere, the planet's temperature would likely be too hot for most species living today.
当我们的太阳后来温度变得更高时，早期细菌持续清除大气中的二氧化碳和甲烷，使地球的气候不至于变得太热而无法维持生命的存在。
When our Sun later became hotter, the continued removal of atmospheric carbon dioxide and methane by early bacteria kept Earth's climate from becoming too hot to sustain life.
垃圾填埋场的废纸会释放甲烷，甲烷是导致全球气候变化的一个重要因素。
Paper in landfills causes the release of methane, a gas that is an important factor in climate change all around the world.
其他古代细菌消耗甲烷，大大减少了甲烷在大气中的含量。
Other ancient bacteria consumed methane, greatly reducing its amount in the atmosphere.
现在，许多科学家把早期造成地球变暖的大部分原因归结于厌氧微生物——产甲烷菌——它产生了温室气体甲烷。
Many scientists now attribute much of the warming of early Earth to oxygen-intolerant microbes—methanogens—that produce the greenhouse gas methane.
重点强调是否生成甲烷的厌氧系统的能力。
The main point stressed is the ability of the anaerobics system to generate methane.
最近在Massey Energy Big Bend 矿山中见证了从新释放的天然气中积聚的甲烷是致命的。
The methane build-up from newly liberated gas is deadly as witnessed in the Massey Energy Big Bend mine recently.
以二溴甲烷和咪唑为原料合成了二（1-咪唑基）甲烷。
Bis (1-imidazolyl) methane was prepared using imidazole and dibromomethane as raw materials.
另一种2-巯基苯并噻唑法是先将溴氯甲烷与硫氰化钠反应生成硫氰酸氯甲酯，然后硫氰酸氯甲酯与2-巯基苯并噻唑反应得到苯噻氰。
It can also be prepared by reaction of bromochloromethane with sodium thiocyanate to obtain chloromethyl thiocyanate, and then it reacts with 2-mercapto-benzothiazole.
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