我正在考虑这个问题，我意识到我不明白他们在水下是如何屏住呼吸的。
I was thinking about it and I realized I don't understand how they hold their breath underwater.
然而，为了更好地理解睡眠中的呼吸，首先了解呼吸的一般工作原理是有帮助的。
To better understand breathing during sleep, it is, however, helpful to first understand how respiration works in general.
氧气在细胞呼吸的新陈代谢过程中是必不可少的，它能使细胞有效地从有机食物中获取能量。
Oxygen is essential for the metabolic process known as cell respiration that allows cells to efficiently harvest energy from organic food.
在这种情况下，只有在几次呼吸不足出现，导致血液中二氧化碳大量增加和氧气减少后，呼吸的力度才得到调整。
Only after several inadequate breaths under such conditions, resulting in the considerable elevation of carbon dioxide and reduction of oxygen in the blood, is breathing effort adjusted.
首先，它们使我们呼吸的空气更清新。
氧气是我们呼吸的空气的一部分。
我们利用植物获得食物、布料、住所，甚至是我们呼吸的空气。
We use plants for food, cloth, shelter (住处) , and even the air we breathe (呼吸) .
得了这个病，意味着她的肌肉，包括她的心脏和控制呼吸的肌肉，都会变得越来越弱。
Having the disease means her muscles, including her heart and muscles that control breathing, will get weaker and weaker.
当新的刺激出现时，心脏和呼吸监测仪为研究者提供其心跳或呼吸的次数。
Heart and respiration monitors provide the investigator with the number of heartbeats or breaths taken when a new stimulus is presented.
你只需注意你呼吸的起伏，将注意力集中到正在感受呼吸的身体部位，无论是肺部，鼻尖还是其他地方。
You simply note the rising and falling of your breath, and focus on the parts of your body where you feel your breath, whether it's in the lungs, tip of your nose or elsewhere.
由于氮占我们呼吸的空气的五分之四，他们对提高火星的温度持惊人的乐观态度，相信这可以在一百年内完成。
Since nitrogen is four fifths of the air we breathe, they are surprisingly optimistic about raising the temperature on Mars and believe it could be done in hundred years.
由于睡眠时呼吸道中的气流阻力更大，并且用于呼吸的肌肉效率有变化，所以在睡眠时呼吸需要用两倍的力气。
It takes twice as much effort to breathe during sleep because of greater resistance to airflow in the airways and changes in the efficiency of the muscles used for breathing.
同时，做一点呼吸的锻炼也有帮助。
交替鼻孔呼吸的12大好处。
一个促进缓慢呼吸的新应用程序可能会有用。
你也可以注意你的腹部，观察它随着呼吸的升降。
You can also bring attention to your belly and notice your abdomen rising and falling with each breath.
人们仿佛听到街口有许多人呼吸的声音。
It seemed as though the breathing of many men could be heard at the end of the street.
使身体处于自然状态，这是为唱歌呼吸的正确方式。
Work out what your body is doing naturally and that is the correct way to breathe for singing.
在佛罗伦萨这个城市里，吃的、睡的、和呼吸的都是艺术。
会留有更多呼吸的空间，但不是移动腿离开直线。
It allows more space for the element of air to flow but moves the leg out of good alignment.
呼吸的动作是伸展；展开肚子中所有需要气息的地方。
The action of taking a breath is tension; expand your tummy at all the places where you need a breath.
健康、纯洁、新鲜、欢快、可以随意呼吸的空气已充满他的周围。
The pure, healthful, living, joyous air that was easy to breathe inundated him.
我们呼吸的空气是珍贵的，越是远离地球表面越是稀薄。
The air you breathe is precious, and the farther from Earth's surface you go, the less there is.
如果不行，戴上薄纱口罩或任何可以盖住嘴巴又能保证呼吸的东西。
If you can't, wear gauze mask or anything that can cover your mouth and enable you to breath.
我们呼吸的频率是由大脑控制的，当感觉到空气浓度的变化时会变快。
The rate at which we breathe is controlled by the brain, which is quick to sense changes in gas concentrations.
研究还发现伦敦人呼吸的空气远比加纳的阿克拉的空气有害。
It found that Londoners breathe in air that is more harmful than that in Accra, the capital of Ghana.
王女士：连呼吸的空气我们都还得担心受怕，这不是件令人悲哀的事吗？
Mrs. Wang: Isn’t it sad that we have to be so careful and worry about the air we breathe?
如果没有迅速的治疗，麻痹会导致窒息死亡，因为呼吸的麻痹。
Without quick treatment, the paralysis will cause asphyxial death because of respiratory paralysis.
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。
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。
Making oxygen and giving Mars a breathable atmosphere is at least theoretically possible.
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