臭氧是氧气与紫外线发生化学反应而产生的。
Ozone is produced by the reaction between oxygen and ultraviolet light.
一棵大树每年可以产生大约100公斤的氧气。
为了调和这两个事实，科学家们假设，几乎所有产生的氧气都被地球表面的铁吸收了。
As a way of reconciling these two facts, scientists have hypothesized that nearly all of the oxygen being produced was taken up by iron on Earth's surface.
除了地球表面的铁以外，一定有什么东西吸收了植物产生的大量氧气。
Something in addition to the iron on Earth's surface must have absorbed much of the oxygen produced by plant life.
大约需要7到8棵树产生足够一个人呼吸一年的氧气。
It takes about 7 to 8 trees to make enough O2 for one person to breathe for a year.
有的细菌利用光合作用所产生的氧气，进一步改变了大气层，使其成为今天的样子。
Bacteria that used oxygen produced by photosynthesis further altered the atmosphere to what we find today.
这是因为在非快速眼动睡眠中，自动的新陈代谢系统对呼吸有排他的控制，身体消耗更少的氧气，产生更少的二氧化碳。
This occurs because during NREM sleep the automatic, metabolic system has exclusive control over breathing and the body uses less oxygen and produces less carbon dioxide.
活跃的叶绿素分子产生的氧气破坏性强，秋天衰弱的树叶随后变得更容易受到影响。
The weakened fall leaf then becomes vulnerable to the highly destructive effects of the oxygen created by the excited chlorophyll molecules.
已经知道一些光合细菌能够利用红外光，但是和植物和蓝细菌不同，这些微生物光合的时候不能产生氧气。
Some photosynthetic bacteria are known to use infrared light, but—in contrast to plants andcyanobacteria—these microorganisms do not produce oxygen.
浮游植物通过光合作用消耗空气中的二氧化碳产生氧气。
Photosynthesis by phytoplankton removes carbon dioxide from the air and produces oxygen.
研究者称碳铁钴复合催化剂能完全将氢气与氧气转化成为水，而不是产生大量双氧水的副产物。
The researchers say the carbon-iron-cobalt catalyst completed the conversion of hydrogen and oxygen into water, rather than producing large amounts of hydrogen peroxide.
据认为，由火山喷发产生的硫磺使氧气从大片海域消失。
It is thought that sulphur produced by volcanoes erupting led to oxygen disappearing from large areas of the oceans.
研究人员建议当白天太阳能电池中产生的电流不做它用的时候来把水分解成氢气和氧气。
The researchers suggest splitting water into hydrogen and oxygen during the day whenever electricity from solar cells is not needed for anything else.
湿地在产生氧气和净化空气方面有至关重要的作用。
The wetland plays a crucial role in producing oxygen and purifying the air.
那么，既然氢气和氧气分子很难结合，那么我们现在的水是怎么产生的？
So, if hydrogen and oxygen molecules are not simply mating up, just what has been the origin of our water?
让你的身边环绕着生命；植物会给你居住的环境带来更多的氧气，并使你产生让它们活下去的想法。
Surround yourself with life; plants will bring more oxygen into your environment and an added sense of purpose, as you want to keep them alive!
把人造叶子放到水中并且有阳光照射就能够很快产生水泡，叶子的一侧产生的是氧气泡，而另一侧则是氢气泡。
Simply placed in a container of water and exposed to sunlight, it quickly begins to generate streams of bubbles: oxygen bubbles from one side and hydrogen bubbles from the other.
研究人员解释说，这个流程的关键组成成分是一个催化剂-放置在水中的钴金属、磷和电极-这个催化剂从水中产生氧气，另一个催化剂产生氢气。
The key component in the process is a catalyst -- cobalt metal, phosphate and an electrode, placed in water -- that produces oxygen gas from water, while another catalyst produces hydrogen gas.
这些被称为浮游植物的微生物，吸收二氧化碳产生世界上一半的氧气量——这等于陆地上的植物和树木所产生的氧气量。
The tiny organisms, known as phytoplankton, also gobble up carbon dioxide to produce half the world's oxygen output-equaling that of trees and plants on land.
绿萝——除了向空气中释放氧气，绿萝还能消除空气中的甲醛(通常来自香烟燃烧产生的烟雾或木制家具的黏合剂)。
Other than releasing oxygen in the air, money plant can also eliminate formaldehyde from the air that is commonly released by cigarette smoke and adhesives (used with wood furnishings).
因此，用过量的氧气进行治疗，可能增加自由基的产生，使本就糟糕的情况更加恶化。
Treating with too much oxygen, therefore, could increase the production of free radicals and make a bad situation even worse.
木材高温加热，有限的氧气不足以使它完全燃烧，于是产生气体，可以作为发动机或内燃机的能源。
Wood heated at high temperatures with minimal oxygen cannot burn completely. Instead, it creates gases that can be used to power generators or internal combustion engines.
走路时小腿肌肉需要更多氧气，但因为血液流动被限制，肌肉就无法获得足够的氧气，进而产生痉挛。
When walking the calf muscles need more oxygen, but because the blood flow is restricted the muscles cannot obtain enough oxygen from the blood and cramp occurs.
最终，蓝藻的出现带来了光合作用，它产生的氧气取代了产甲烷菌和甲烷气体，与今日相似的大气层终于形成了。
Eventually, photosynthesis arrived in the form ofcyanobacteria. Their exhalations, oxygen, did for both methanogens and methaneand created an atmosphere similar to the one that exists now.
但这个发现的重要意义在于，包括氧气产生在内的化学作用也发生在我们太阳系的其它地方。并且，这样的化学反应在太阳系以外也可能同样非常普遍。
But the discovery is significant in that it proves that chemistry involving oxygen occurs naturally elsewhere in our own solar system, and could be quite common outside of it as well.
这种汽车可以将氢储存在车上，然后将氢和大气中的氧气在电池箱中混合，产生电力。
It is a car that stores hydrogen on board, and, mixing the hydrogen and atmospheric oxygen in the fuel cell stack, creates electricity, said Mittleman.
系统使用只会产生水和氧气的过氧化氢环保推进剂，类似家庭常备医药箱里的过氧化氢溶液。
The system runs on a green hydrogen peroxide propellant that leaves behind only water and oxygen, a solution not too far from the hydrogen peroxide in the common medicine cabinet.
这种办法的另一个好处在于，产生的水蒸汽能够稀释周围空气中的氧气浓度，从而抑制火焰的燃烧。
As a bonus, the steam also smothers the flames by diluting the amount of oxygen in the surrounding air.
这种办法的另一个好处在于，产生的水蒸汽能够稀释周围空气中的氧气浓度，从而抑制火焰的燃烧。
As a bonus, the steam also smothers the flames by diluting the amount of oxygen in the surrounding air.
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