臭氧是一种高度活跃的氧气形态。
一切生命归根到底都要依赖氧气。
人吸入氧气，呼出二氧化碳。
她被戴上了氧气面罩并输上了静脉点滴。
燃烧化石燃料消耗氧气并产生二氧化碳。
Burning fossil fuels uses oxygen and produces carbon dioxide.
血液是把氧气输送到身体各部分的媒介。
Blood is the medium in which oxygen is carried to all parts of the body.
血把氧气输送到全身。
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.
鱼用鳃吸取氧气。
植物吸收氧气。
如果头痛只发生在晚上，缺少新鲜空气和氧气常常是其原因。
If headaches only occur at night, lack of fresh air and oxygen is often the cause.
这种药增加血液里的红细胞数量，将氧气吸收量提高百分之十。
The drug increases the number of red cells in the blood, enhancing oxygen uptake by 10 percent.
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.
没有氧气，大脑很快就会受损。
爬得越高，空气中的氧气就越少。
有几种化学物质取代了氧气。
这再次暗示着打哈欠与氧气几乎没有关系。
Again the implication is that yawning has little or nothing to do with oxygen.
你睡觉时呼吸更少，所以你得到的氧气更少。
火箭中的爆炸性混合物包括燃料和氧气供应。
The explosive mixture in a rocket consists of both a fuel and a supply of oxygen.
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.
它们在血液中储存氧气的能力也比陆栖动物强。
They also have a greater capacity than land animals to store oxygen in their blood.
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.
当氧气消耗殆尽分解便停止，留下剩余的有机物。
As soon as the oxygen is gone, decay stops and the remaining organic matter is preserved.
空气不能穿透土壤颗粒，这使得土壤中缺少氧气。
Air cannot penetrate between the soil particles, making the soil oxygen-poor.
氧气可以用来呼吸，氢气可以变成燃料，火箭燃料。
Oxygen could be used to breathe, and hydrogen could be turned into fuel, rocket fuel.
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.
这是鲸鱼的血液将氧气输送到身体其他部位的方式。
It's the way the whale's blood carries oxygen to the rest of its body.
为了燃烧，野火需要合适的条件，燃料，氧气和热量。
To bum, wildfires require the right conditions, fuel, oxygen and heat.
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.
他展示了消防员的装备，包括氧气面罩，还鼓励听众把玩并试戴氧气面罩。
He displays fire fighters' equipment, including the oxygen mask, which he encourages his listeners to play with and put on.
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