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自古以来,人們就把血液看作是极宝貴的东西。这种看法拿現代的科学知識来衡量,也是完全正确的。我們知道人的身体是由无数細胞构成的,活的細胞每时每刻都在消耗氧气和营养物质,需要血液不断运来供应它們,同时細胞新陈代謝产生的廢物也需要血液随时把它們运走。一旦血液丧失了这种功能,那么只要几分钟时間,象脑子、心臟这些重要器官,就会遭到难以挽回的損害,从这一点也就可以看到血液在人体是多么重要了。血液要完成它的正常功能,首先必須保证有足够的
Since ancient times, people have regarded blood as an extremely valuable thing. This view is based on modern scientific knowledge and is also completely correct. We know that the human body is made up of a myriad of cells. Living cells consume oxygen and nutrients all the time. They need the blood to continuously supply them. At the same time, the waste generated by cell metabolism needs the blood to transport them at any time. go. Once the blood loses this function, it takes only a few minutes for important organs like the brain and the heart to suffer irretrievable damage. From this point one can also see how important blood is in the human body. To complete its normal function, blood must first ensure that it has sufficient