氧的反应性很高。
All life depends ultimately on oxygen.
一切生命归根到底都要依赖氧气。
Fish take in oxygen through their gills.
鱼用鳃吸取氧气。
Hydrogen and oxygen combine to form water.
氢与氧化合成水。
Hydrogen combines with oxygen to form water.
氢与氧化合成水。
Ozone is a highly reactive form of oxygen gas.
臭氧是一种高度活跃的氧气形态。
The brain requires a constant supply of oxygen.
大脑需要持续的供氧。
A stroke can disrupt the supply of oxygen to the brain.
中风可导致大脑供氧中断。
A lack of oxygen may inhibit brain development in the unborn child.
缺氧可能阻碍胎儿的大脑发育。
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。
Smoking and drinking interfere with your body's ability to process oxygen.
吸烟和喝酒妨碍身体对氧的吸收能力。
Water contains hydrogen and oxygen.
水含有氢和氧。
Water is composed of hydrogen and oxygen.
水由氢与氧化合而成。
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。
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。
Water is a compound containing the elements hydrogen and oxygen.
水是含有氢元素和氧元素的化合物。
Water is a compound containing the elements of hydrogen and oxygen.
水是含有氢元素和氧元素的化合物。
A drop in oxygen pressure can cause headaches in certain individuals.
氧分压的下降会使一部分人头痛。
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。
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。
A third is certain basic chemicals such as carbon, oxygen and nitrogen.
第三种是某些基本的化学物质，如碳、氧和氮。
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。
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。
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？
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。
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。
Under the atmosphere, scientists think there is a very thin crust of carbon and oxygen.
科学家们认为在大气层下存在着一层由碳和氧组成的稀薄地壳。
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