Fish take in oxygen through their gills.
鱼用鳃吸取氧气。
All life depends ultimately on oxygen.
一切生命归根到底都要依赖氧气。
Ozone is a highly reactive form of oxygen gas.
臭氧是一种高度活跃的氧气形态。
Ozone is produced by the reaction between oxygen and ultraviolet light.
臭氧是氧气与紫外线发生化学反应而产生的。
Several chemicals have displaced the oxygen.
有几种化学物质取代了氧气。
Without oxygen, the brain is damaged quickly.
没有氧气，大脑很快就会受损。
To bum, wildfires require the right conditions, fuel, oxygen and heat.
为了燃烧，野火需要合适的条件，燃料，氧气和热量。
You breathe less when you sleep, so you get less oxygen.
你睡觉时呼吸更少，所以你得到的氧气更少。
Whales carefully conserve their oxygen when underwater in a couple of ways.
鲸鱼在水下以几种方式小心地保存它们的氧气。
When people don't get enough oxygen, they often begin to gasp for air.
当人们得不到足够的氧气时，常常就会开始喘气。
Trees help keep the air clean and they make oxygen that we can breathe.
树木有助于净化空气，释放出可供我们呼吸的氧气。
Again the implication is that yawning has little or nothing to do with oxygen.
这再次暗示着打哈欠与氧气几乎没有关系。
They also have a greater capacity than land animals to store oxygen in their blood.
它们在血液中储存氧气的能力也比陆栖动物强。
How does having more oxygen in their blood help them stay underwater longer?
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？
Because she has three or four lungs which provide plenty of oxygen for both twins.
因为她有三四个肺，可以为两个双胞胎提供充足的氧气。
The higher one climbs, the less oxygen there is in the air.
爬得越高，空气中的氧气就越少。
Blood transports oxygen around the body.
血把氧气输送到全身。
Humans take in oxygen and breathe out carbon dioxide.
人吸入氧气，呼出二氧化碳。
Blood is the medium in which oxygen is carried to all parts of the body.
血液是把氧气输送到身体各部分的媒介。
Oxygen could be used to breathe, and hydrogen could be turned into fuel, rocket fuel.
氧气可以用来呼吸，氢气可以变成燃料，火箭燃料。
So where could this oxygen come from?
这些氧气是从哪里来的呢？
No big deal, you might think, there is oxygen everywhere.
你也许会想，没什么了不起的，到处都是氧气。
There, they are offloaded onto the oxygen, completing the reaction (see diagram).
在那里，他们被卸到氧气里，完成反应(见下图)。
你需要更多的氧气。
But it still has this incredible ability to release oxygen.
但它仍然拥有令人不可思议的释放氧气的能力。
Breathe out. We're getting plenty of oxygen.
吸进，呼出，我们得到很多的氧气。
燃烧脂肪需要更多的氧气。
Finally the room where oxygen is produced.
最后的房间是制造氧气的地方。
They consume carbon dioxide, and release oxygen.
它们消耗二氧化碳，并释放氧气。
FOOD and oxygen pass easily from mother to fetus.
食物和氧气很容易从妈妈身体传递给胎儿。
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