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If blood didn't circulate through our bodies, carrying oxygen and nutrients, we wouldn't be able to live.
如果血液不能在我們身體內循環，為人體輸送氧氣和營養，我們便無法存活。
Blood is so important to life that the body constantly makes new blood.
血液對生命十分重要，所以人體會不斷的制造新鮮血液。
To do this, the body must produce the liquid part of blood, called plasma, and the cells that float in it.
人體在造血時必須要產生血液的液體部分，即血漿，以及浮在血漿上的細胞。
Plasma is made mostly of water and salts that we absorb through our digestive tracts everyday.
血漿主要由我們通過消化道每天吸收的水和鹽組成。
Its job is to deliver nutrients and water throughout the body.
它的作用就是輸送水和營養物質到全身各個部位。
Ninety-nine percent of the blood cells floating in plasma are red blood cells, which carry oxygen from the lungs to the rest of the body and give blood its red color.
浮在血漿上99%的血細胞都是紅細胞，它們會把肺部的氧氣輸送到全身各處，這樣血液才會呈現出紅色。
The average life of a red blood cell is four months.
一個紅細胞的平均壽命是4個月。
What Happens After That?
接下來會發生什么呢？
The spleen continuously destroys millions of old red blood cells, recycling the iron to make new red cells.
脾臟不斷地將數百萬老化的紅細胞解體，循環利用其中的鐵元素來制造新的紅細胞。
譯文來自可可英語
