A molecule of water consists of two atoms of hydrogen and one atom of oxygen.
水分子由两个氢原子和一个氧原子构成。
Two atoms of hydrogen combine with one atom of oxygen to form a molecule of water.
两个氢原子和一个氧原子结合组成一个水分子。
To do CPR, you press on the sick person's chest so that blood moves through the body and takes oxygen to organs.
做心肺复苏时，你要按压病人的胸部，使血液在体内流通，将氧气输送到各个器官。
The reconstructed mammoth hemoglobin could deliver oxygen at colder temperatures than the human form of the protein could handle.
重组的猛犸象血红蛋白可以在比人类血红蛋白更低的温度下输送氧气。
By measuring the proportion of heavier hydrogen and oxygen isotopes along a strand of hair, scientists can construct a geographic timeline.
通过测量一束头发上较重的氢和氧同位素的比例，科学家可以构建一个地理时间轴。
Experiments have also cast serious doubt on the belief that yawning is triggered by a drop in blood oxygen or a rise in blood carbon dioxide.
对于打哈欠是由血液中的氧气减少或血液中的二氧化碳增加引起的这种观点，一些实验也同样提出了严重的质疑。
As a way of reconciling these two facts, scientists have hypothesized that nearly all of the oxygen being produced was taken up by iron on Earth's surface.
为了调和这两个事实，科学家们假设，几乎所有产生的氧气都被地球表面的铁吸收了。
The modern atmosphere supports many forms of complex life that would not have been able to exist in Earth's first atmosphere because the oxygen level was too low.
现代大气层支持着许多复杂的生命形式，而这些生命在地球最初的大气层中是不可能存在的，因为当时的氧气含量太低。
The adult tree gives us shade, oxygen and natural beauty.
大树为我们提供荫蔽、制造氧气，让我们享受大自然的美丽。
In fact, the Amazon Rainforest is the "lungs of our planet" because it produces 20% of the world's oxygen.
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。
Rainforests are the lungs of the planet storing vast quantities of carbon dioxide and producing a significant amount 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。
Forests contribute to the balance of oxygen, carbon dioxide and humidity.
森林促进空气中氧气、二氧化碳和湿度的平衡。
The wetland plays a crucial role in producing oxygen and purifying the air.
湿地在产生氧气和净化空气方面有至关重要的作用。
If it were not for oxygen and nitrogen in the air, no man could live on the earth.
大气中如果没有氧和氮，人就无法生存于地球了。
Some, like hemoglobin, deliver oxygen from the lungs to the far reaches of the body.
有些蛋白质像血红蛋白一样，可以把氧从肺部输送到身体各处。
Hydrogen fuel cells work by combining hydrogen and oxygen to produce electricity.
氢燃料电池通过氢氧结合产生电能。
Photosynthesis by phytoplankton removes carbon dioxide from the air and produces oxygen.
浮游植物通过光合作用消耗空气中的二氧化碳产生氧气。
The vast source of water could one day be used to generate oxygen or sustain a moon base.
这个巨大的水源也许在未来的某一天可以用来制造氧气或者维持月球基地用水。
Making oxygen and giving Mars a breathable atmosphere is at least theoretically possible.
制造氧气和让火星拥有可供呼吸的空气至少在理论上是可行的。
Fresh air provides your body with an abundance of oxygen that promotes healing and mental clarity.
新鲜的空气为你的身体提供充足的氧气，从而可以促进身体的恢复和思想的清爽。
Stars with even lower amounts of oxygen and iron offer insight into the birth of the galaxy itself.
那些拥有更少氧气和铁元素的恒星能帮助我们深刻了解银河系本身的起源。
Trees absorb carbon dioxide through their leaves and break it down, releasing oxygen into the air.
树木通过树叶吸收二氧化碳，并使之分解，而后向空气中释放氧气。
Life on Earth requires six basic ingredients-carbon, hydrogen, nitrogen, oxygen, sulfur and phosphorus.
构成地球生命需要六项基本要素：碳、氢、氮、氧、硫、磷。
As a bonus, the steam also smothers the flames by diluting the amount of oxygen in the surrounding air.
这种办法的另一个好处在于，产生的水蒸汽能够稀释周围空气中的氧气浓度，从而抑制火焰的燃烧。
An ambulance sped him to the hospital while a paramedic administered CPR to keep blood and oxygen flowing.
救护车迅速把他送往医院，医护人员在车上对他实施了心肺复苏，使血液和氧气正常循环。
That sharp rise in oxygen may have been the catalyst to the evolution of animals, including our ancestors.
氧含量的猛增可能是动物(包括人类祖先)出现的一剂催化剂。
Using liquid hydrogen and oxygen in rockets will provide major advantages for landing astronauts on the moon.
以液氢和液氧为燃料的火箭将为宇航员登陆月球提供尤其重要的有利条件。
Using liquid hydrogen and oxygen in rockets will provide major advantages for landing astronauts on the moon.
以液氢和液氧为燃料的火箭将为宇航员登陆月球提供尤其重要的有利条件。
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