Blood

Blood. Written by Martin Bolod. Illustrated by Alan Baker and Sholto Walker.

《血液》。作者：马丁·博洛德。绘者：艾伦·贝克、肖托·沃克。

Blood is good. If you've ever cut yourself or had a nosebleed, you'll know that your body is filled with a red liquid, blood. When you cut yourself, blood oozes out of your skin.

血液很有用哦。如果你曾经割伤过自己或者流鼻血，就会知道你的身体里充满了一种红色的液体，那就是血液。 你割伤自己的时候，血液会从皮肤里渗出来。

A newborn baby has enough blood in its body to fill a mug. An adult has about 5 litres of blood. That's enough to fill 15 mugs! Blood does lots of very important jobs in your body. It keeps you alive. Blood gives your body the things it needs and takes away the things it doesn't. It also helps to fight germs and illnesses.

新生儿体内的血液总量刚好能装满一个马克杯。 成年人的体内大约有5升血液，足足能装满15个马克杯哦！ 血液在你的身体里承担着很多非常重要的工作。 它维持着你的生命。 血液给身体输送所需的养分，再带走身体不需要的废物。 它还能帮助身体对抗细菌和疾病。

Cells Each drop of blood in your body has millions of tiny cells in it. These blood cells float in a watery liquid. There are two different kinds of blood cells. Red blood cells and white blood cells. The little round blobs here are your blood cells. This is how your blood would look if you could see the cells 1000 times bigger than they actually are.

细胞 你体内的每一滴血液里都有数百万个微小的细胞。 这些血细胞漂浮在一种水状的液体里。 血细胞分为两种不同的类型。 分别是红细胞和白细胞。 这里这些圆圆的小点点就是你的血细胞。 如果把细胞放大1000倍，你的血液看起来就是这个样子的。

Blood cells are made inside your bones. Your bones are very hard on the outside, but inside they are hollow and filled with a soft jelly. Blood cells are made in this jelly and then sent all around your body. Fact. Each blood cell lives for about four months and a healthy person makes millions of new blood cells in their bones every day.

血细胞是在你的骨头里制造的。骨头的外层非常坚硬，但内部是中空的，装满了柔软的果冻状物质。 血细胞就是在这种果冻状物质里制造出来的，之后会被输送到你的全身各处。 小知识：每个血细胞的寿命大约是四个月，健康的人每天都会在骨头里制造出数百万个新的血细胞。

Red blood cells Most of the cells in your blood are red blood cells. A single drop of blood contains about 300 million of them. Red blood cells are disc shaped, but are thicker at the edges than at the centre, a bit like a pizza. This is how your red blood cells look close up.

红细胞 你血液里的大部分细胞都是红细胞。 仅仅一滴血里就含有大约3亿个红细胞。 红细胞是圆盘形状的，边缘比中心厚，有点像披萨。 这就是红细胞放大后的样子。