“肾功能衰竭往往会危及患者的生命，现在可以采用人工肾代替患者已丧失功能的肾，其原理就是肾透析，如图是肾透析仪示意图和正常人体内尿液形成的示意图．在透析仪器中，通过导管与患者的动脉和静脉相连，管内有一种半透膜，膜外是特殊药液﹣透析液，新鲜透析液的成分与血浆相似．当患者的血液透过这些管子时，其中的废物就透过半透膜扩散到膜外透析液中取，而透析液还可以向患者的血液提供人体所需要的物质．最后经过透析的、除去废物的血液再由静脉流回人体内．

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    Everybody wants to be healthy. You know food is very important.There are many healthy foods. You can have more bananas, apples, oranges,tomatoes and lettuce because fruits and vegetables are good for you. But don't eat too much chocolate. It's not good for you. But don't eat too much chocolate. It's not good healthy food. Healthy food can make you grow and make you strong and happy. Remember there is a saying, “An apple a day keeps the doctor away.” Sports can also keep you healthy. Get up early and do some sports every day. Don't be lazy! You will be healthy and happy.