阅读翻译When you cut your skin, you bleed. If a person loses a l

阅读翻译
When you cut your skin, you bleed. If a person loses a lot of blood, he will become ill and may die．Blood is very important. People have always known that．At one time, some people even drank blood to make them strong!When doctors understand how blood goes around inside the body, they try ways of giving blood to people who need it. They take blood from the healthy people and give it to people who need it. This is called " blood transfusion". The blood goes from the arm of the healthy person into the arm of the sick person.But there are two problems. First, it does not always work. Sometimes people die when they have blood transfusion. Later, doctors find that we do not all have the same kind of blood．There are four groups—O, A, B and AB．We all have blood of one of these groups. They also find that they can give any kind of blood to people of group AB．But they find that they must give A-group blood to A-group people and B-group blood to B-group people. I have O-group blood and the doctor told me that I could give blood to anyone else safely.There is another problem. To give blood of the right kind, doctors have to find a person of the right blood group. Often they can not find a person in time. If they have a way to keep the blood until someone needs it, they can always have the right kind of blood．At first they find they can keep it in bottles for fifteen to twenty days. They do this by making it very cold．Then they find how to keep it longer. In the end they find a way of keeping blood for a very long time.We call a place where we keep money a "bank". We call a place where we keep blood a "blood bank". One day, when you grow up, you may decide to give blood to a "blood bank". In this way you may stop someone from dying. Or perhaps one day you may become ill. You may need blood．The "blood ban" will give it to you.

当你切你的皮肤,你流血.如果一个人失去了很多血,他会生病,并可能会死血是非常重要的.人们总是知道.在同一时间,有些人甚至喝血,使他们强!当医生了解如何血液在身体内绕时,他们尝试的血液给需要它的人的方式.他们从健康人的血液,给需要的人.这就是所谓的“输血”；.血液从健康人进入病人的人的手臂臂.但是有两个问题.首先,它并不总是工作.有时候,人死的时候他们输血.后来,医生发现,我们不都有相同的血型.有四个组-啊,A,B和AB.我们都有这些组的血.他们还发现他们可以任何种类的血液组的人的抗体.但他们发现,他们必须给A组和B组血的人的血液B组的人.我是O型血,医生告诉我,我可以给其他任何人的血液安全.还有一个问题.给合适的血液,医生必须找到一个合适血型的人.他们往往不能及时找到一个人.如果他们有办法保持血液,直到有人需要它,他们总是能有合适的血.起初,他们发现他们可以保持在十五至二十天的瓶子.他们使这个非常冷.然后他们找到如何保持更长的时间.最后他们找到一种方式保持了很长一段时间的血液.我们呼吁我们的地方保持货币"；银行”；.我们把我们所保留的血”,“血液银行；.有一天,当你长大后,你可能决定献血的"；血液银行”；.这样你可能会停止濒临死亡的人.也许有一天你会生病的.你可能需要血液."；血禁令"；要将这地赐给你.