因为早期的地球大气中缺乏氧气，所以也缺乏起保护作用的臭氧层屏障。
Because early Earth lacked oxygen in its atmosphere, it also lacked a protective ozone barrier.
我们太阳系的其他行星缺乏氧气大气层，这有助于解释为什么地球上存在生命。
Other planets in our solar system lack the oxygen atmosphere that helps explain why life exists on Earth.
由于它们缺乏氧气，沼泽沉积物中的硫化物含量很高，而硫化物对大多数植物都有毒。
Because they lack oxygen, marsh sediments are high in sulfides that are toxic to most plants.
火星上面过于干燥，并且缺乏氧气。
火星上面过于干燥，并且缺乏氧气。
水星上面过于干燥，并且缺乏氧气。
结果，他们成为缺乏氧气脆弱的细胞而消失。
As a result, they become starved of oxygen and the delicate cells die away.
不正确的呼吸可以导致缺乏氧气，甚至虚弱。
Incorrect breathing can lead to lack of oxygen and even faintness.
若将植物放在缺乏氧气的大气中，大气很快补充了氧气。
If a plant is placed in an atmosphere devoid of oxygen, it very soon replenishes the oxygen.
中风发生的时候大脑局部供血被阻断或严重减少，使得脑组织缺乏氧气和营养物质。
A stroke occurs when the blood supply to part of the brain is interrupted or severely reduced, depriving brain tissue of oxygen and nutrients.
当我们中风时，大脑缺乏氧气，造成神经元细胞大批死亡，导致我们瘫痪在床并且无法说话。
When we have a stroke, our brain is starved of oxygen, causing the catastrophic death of those nerve cells and leaving us paralysed and unable to speak.
如果流动的血液不能很快恢复，这部分的心脏肌肉损坏并且缺乏氧气人就会开始死亡。
If the flow of blood isn't restored quickly, the section of heart muscle becomes damaged from lack of oxygen and begins to die.
极度恐惧的受害者甚至还没有意识到发生了什么事情，就被火暴吞没，缺乏氧气而失去了知觉。
The horrified victims have little chance to even realize what is happening before they are engulfed and lose consciousness from lack of oxygen.
缺乏氧气的抑制衰减，热量和压力，几千年来，把木材变成坚实的石英色彩的杂质一样，铁，碳，锰。
Lack of oxygen inhibited decay, and heat and pressure over millennia turned the wood into solid quartz colored by impurities like iron, carbon, and manganese.
俄亥俄州克里夫兰市美国国家航空航天局格伦研究中心的杰弗里．兰迪斯说，火星环境干燥，而且大气中缺乏氧气，这意味着那里的铁没有生锈。
The dry conditions and lack of atmospheric oxygen mean that the stuff has not rusted, says Geoffrey Landis of NASA's Glenn Research Center in Cleveland, Ohio.
其他行星上没有氧气，这意味着这些行星缺乏保护生命体免受紫外线辐射的臭氧层。
The absence of oxygen on other planets means that those planets lack an ozone shield to protect life forms against UV radiation.
在火星和我们太阳系的其他行星上没有氧气，这意味着这些行星也缺乏保护地表生物免受紫外线辐射的臭氧层。
The absence of an oxygen atmosphere on Mars and other planets in our solar system means that these planets also lack an ozone shield that would protect surface-dwelling life from UV radiation.
造成中风的病理情况，是脑细胞缺乏血液和氧气供应。
The pathological condition underlying cerebrovascular accident is a lack of blood and oxygen to the brain cells.
提升的细胞需要氧气以维持生存，如果它们缺乏足够长时间就会开始死亡；
Ascending cells require oxygen to continue to exist and if they are deprived long enough will begin to die;
提升的细胞需要氧气以维持生存，如果它们缺乏足够长时间就会开始死亡；
Ascending cells require oxygen to continue to exist and if they are deprived long enough will begin to die;
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