Our lungs fuel us with oxygen, the body's life-sustaining gas. They breathe in air, then extract the oxygen and pass it into the bloodstream, where it's rushed off to the tissues and organs that require it to function.
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They breathe in air, then extract the oxygen and pass it into the bloodstream, where it's rushed off to the tissues and organs that require it to function.
他们吸入空气,然后把氧气提取出来并进入血液的流动中,被带到需要氧气来维持功能的组织和器官中。
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。
They live in air thick with viral loads, and they are exposed every time they breathe in.
它们活在病毒萦绕的污浊空气里,每吸一口气,都暴露在病毒当中。
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