有几种化学物质取代了氧气。
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.
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.
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.
日本官员说，正是被释放的蒸汽包含的可燃氢气在接触到大气中的氧气后，导致了那次爆炸。
The venting process triggered the explosion when combustible hydrogen released by the steam mixed with oxygen in the air, officials said.
这些营养养育了大量藻类，这些藻类吸收水中的氧气。
The nutrients feed algal blooms, which suck up the oxygen in the water.
氨基酸是构成蛋白质的砖块，正是各种氨基酸的不同排列方式造就了不同的蛋白质，包括组成头发的角蛋白和运输氧气的血红蛋白。
Proteins are long chains of building blocks called amino acids, the specific number and arrangement of which makes each protein—whether it makes up your hair or carries oxygen in your blood—unique.
体型更大的生物生存的关键因素是氧气，氧含量的变化史也刻在了埃迪·卡拉岩石群上。
A key requirement for larger creatures is oxygen, and the dramatic history of oxygen levels is also etched in Ediacaran rocks.
由于那种浮游生物下沉，滋养了下面的细菌，使其形成二级繁荣，大量消耗了深层海域的氧气。
As that plankton sank, it fed a secondary boom among the bacteria below, consuming much of the oxygen in deeper waters.
如果他们实现了这些，下一步就是改造货舱形状以能运载人类。这个不只是用螺丝安装座椅和提供氧气这么简单。
But even if they do, the next step - adapting the cargo vessel so that it can carry people - will be a lot more complex than simply bolting in seats and pumping in oxygen.
当这些氮到达了海洋时，就会引起海洋藻类生物在短时间内疯狂生长，就会耗进水里的氧气。
When this nitrogen reaches the sea it causes a brief frenzy of algal growth which depletes the water of oxygen.
当我和玛吉不再通话的时候，我的“飞船”碎了，我的宇航服里有充足的氧气，但是我没有任何什么能依靠的了。
When Margie and I stopped talking, it was as if the craft had blown to bits. I had plenty of oxygen in my suit, but I was no longer tethered to anything.
不过，事实仍然是，仅仅改变氧气浓度一项指标，蜻蜓的体型就自然增大了。遗憾的是，我们不能把这些巨型蜻蜓放到野外去对付那些致人死命的蚊子。
Still, the fact remains that a simple change in oxygen levels produced naturally giant dragonflies--too bad we can't release them into the wild to take care of those deadly mosquitoes .
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.
结果表明氧气加速了反应。
The results seem to show that oxygen quickens the reaction time.
他的任务是找到失踪的核弹头并拆除上面的引信（反映了技术之危险），虽然后来任务完成，潜水衣中的氧气却不足以支撑他重新返回钻台了（反映了技术之不足）。
He needs to disarm a lost nuclear warhead (technology as danger), and while he is successful, he does not have enough oxygen left in his suit to return to Deep Core (technology as inadequate).
在1838年，英国科学家RobertGrove证明了电解可以被反向进行，他的实验向大家展示了在有催化剂的情况下如何用氢气和氧气反应来产生电能。
In 1838, English scientist Robert Grove showed how electrolysis could be worked in reverse, and how hydrogen and oxygen react together in the presence of a catalyst to produce electricity.
和他的前辈阿尔弗雷德·哈姆斯沃斯一样，阿桑奇深知，公众关注就象是氧气一样，没有了它，再猛的料也会因为无人阅读而沉寂。
Like Alfred Harmsworth before him, Assange understands that without the oxygen of publicity, data dies unread.
我问我自己母亲可能在哪里，她是否也经受住了毒害，她的肺是否也适应了这孤寂的险恶和氧气的匮乏。
I asked myself where my mother could be, whether she'd also been able to withstand the poison, her lungs adapt to this solitary inclemency and the dearth of oxygen.
在这个过程中，他们发现了心血管系统里的新成员，包括那些不是为大脑提供富含氧气血液的物质。
In the process, they are uncovering new roles for the cardiovascular system, including ones that go beyond supplying the brain with plenty of oxygen-rich blood.
它增加了代谢效率，调节了神经递质和大脑氧含量，大脑使用了身体20%的氧气。
It increases metabolism efficiency, regulates neurotransmitters, and boosts oxygen levels in the brain which USES 20% of the body's oxygen.
但他们同时也制造了在当时是毒气的气体——氧气。
But they also produced what was in their world a poisonous gas-oxygen.
尽管巴西今年焚毁的森林相当于卢森堡大小，并且这片森林提供了世界20%的氧气。
Thisyear Brazil still burned down a Luxembourg-sized swath ofa forest that provides 20 percent of the world's oxygen.
我感觉他的房间里的空气变得稀薄了，好像有个人把我肺部里的氧气都给吸走了似的。
I feel as if the air in his apartment has gotten thinner, or as if someone has siphoned most of the oxygen out of my lungs.
据信，蒸汽中的氢气混合了氧气，导致了这两次爆炸。
Hydrogen in the steam is believed to have mixed with oxygen, causing the two explosions.
救援了队员给他戴上了氧气面罩。他的儿子前一天发现老人躺在家中倒塌的房屋里，于是徒步到北川找救援队帮忙。
His son had found him lying amid the rubble of his home the day before, and had gone into Beichuan to get a rescue team.
对于氧气的需要解释了玻义耳的菌类，为何在隔绝空气之后就停止发光了。
The need for oxygen explains why Boyle's fungus stopped glowing when the air was removed.
对于氧气的需要解释了玻义耳的菌类，为何在隔绝空气之后就停止发光了。
The need for oxygen explains why Boyle's fungus stopped glowing when the air was removed.
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