臭氧是一种高度活跃的氧气形态。
你睡觉时呼吸更少，所以你得到的氧气更少。
树木有助于净化空气，释放出可供我们呼吸的氧气。
Trees help keep the air clean and they make oxygen that we can breathe.
因为她有三四个肺，可以为两个双胞胎提供充足的氧气。
Because she has three or four lungs which provide plenty of oxygen for both twins.
这种气体是硫化氢，上升后与石灰岩裂缝中地下水的氧气混合。
This gas is hydrogen sulfide, rises up and mixes with oxygen in the underground water that sits in the cracks and fissures in the limestone.
血液中含有更多的氧气这一特点是如何帮助它们在水下待得更久的呢？
How does having more oxygen in their blood help them stay underwater longer?
在实验室里，当海豹潜入到水面以下并停止呼吸时，它的心脏跳动得更慢，需要的氧气更少，动脉也会收缩。
In the laboratory, when the seal dives below the surface of the water and stops breathing, its heart beats more slowly, requiring less oxygen, and its arteries become constricted.
如果冠状动脉没有重大堵塞，心脏的各个部位会收到等量的氧气。
If all the coronary arteries are free of significant obstructions, all parts of the heart will receive equal amounts of oxygen.
爬得越高，空气中的氧气就越少。
空气中只有0.13%的氧气。
尤里斯说：“很遗憾，他们只提供给我们呼吸需要的氧气。”
"It's a pity that they only give us the oxygen (氧气) we breathe," Joris said.
事实上，亚马逊雨林是“地球之肺”，因为它为地球供给了20%的氧气。
In fact, the Amazon Rainforest is the "lungs of our planet" because it produces 20% of the world's oxygen.
当你进行像步行20分钟这样的运动时，你的大脑会获得更多的氧气。
Your brain gets more oxygen when you do exercise like a 20-minute walk.
雨林是地球之肺，储存了大量的二氧化碳，并为世界生产了大量的氧气。
Rainforests are the lungs of the planet storing vast quantities of carbon dioxide and producing a significant amount of the world's oxygen.
在8000米的高度，只有30%的氧气，人体只能处于这个高度仅几天，所以人类再往上爬是危险的。
At the height of 8,000 meters, there is only 30% O₂ and the human body can only stand this height for a few days, so it is dangerous for humans to climb higher.
鲸鱼在水下以几种方式小心地保存它们的氧气。
Whales carefully conserve their oxygen when underwater in a couple of ways.
一棵大树每年可以产生大约100公斤的氧气。
当人们得不到足够的氧气时，常常就会开始喘气。
When people don't get enough oxygen, they often begin to gasp for air.
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.
限制人体体能表现的因素之一是肌肉从血液中吸收的氧气量。
One of the limiting factors in human physical performance is the amount of oxygen that is absorbed by the muscles from the bloodstream.
这是我的报告：比拉密契河的主要问题之一是水中的氧气含量太低。
This is my report: One of the major problems in the Biramichi river is that the level of oxygen in the water is too low.
当你头脑迟钝时，交替鼻孔呼吸给大脑两边带来等量的氧气，以改善大脑功能。
When your mind is dull, alternate nostril breathing brings equal amounts of oxygen to both sides of the brain for improving brain function.
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.
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.
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.
他推断，铁吸收或多或少的氧气是由于金伯利岩浆本身的条件——主要是由于热量和可用的氧气。
He reasoned that iron took on more or less oxygen in response to conditions in the kimberlitic magma itself—mainly in response to heat and the available oxygen.
乌克兰紧急情况部部长弗拉基米尔·珊德拉告诉当地媒体，存放在大楼地下室的氧气罐可能引发了爆炸。
Volodymiyr Shandra, the Ukrainian Emergency Situations minister, told local media that oxygen canisters being stored in the basement of the building could have triggered the blasts.
对于打哈欠是由血液中的氧气减少或血液中的二氧化碳增加引起的这种观点，一些实验也同样提出了严重的质疑。
Experiments have also cast serious doubt on the belief that yawning is triggered by a drop in blood oxygen or a rise in blood carbon dioxide.
现代大气层支持着许多复杂的生命形式，而这些生命在地球最初的大气层中是不可能存在的，因为当时的氧气含量太低。
The modern atmosphere supports many forms of complex life that would not have been able to exist in Earth's first atmosphere because the oxygen level was too low.
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.
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