科学家告诉我们:血液对人体生命是重要的。我们从饮食中得到的各种营养物质,从肺部吸入的新鲜氧气,都要通过血液——这条“红色交通运输线”运往全身,供各处组织利用。全身各处组织产生的一些无用的或有害的物质如尿素、二氧化碳等,同样需要由血液运送,通过肺、肾、皮肤等器官排出体外。当你生病的时候,药物通常也要有血液的帮忙才能发挥作用。没有血液传送某些性激素,三尺孩童便不能长成体格魁梧的大人;男女之间将缺乏性的差异;甚至后代都无法繁衍。没有血液的辛勤工作,我们也难以使身体保持正常的温度、酸碱度、渗透压,等等。血液中的白细胞和各种免疫物质对身体具有保护作用当病菌侵入身 Scientists tell us that blood is important to human life. The various nutrients we get from our diet and fresh oxygen inhaled from the lungs are transported to the body through the blood - the “red traffic line” - for the benefit of all organizations. Organically generated throughout the body of some useless or harmful substances such as urea, carbon dioxide, also need to be transported by the blood, through the lungs, kidneys, skin and other organs excreted. When you’re sick, the medicine usually needs the help of blood to work. Without the blood transmitting some sex hormones, three feet of children can not grow into burly adults; there will be a lack of sexual differences between men and women; and even future generations will not be able to reproduce. Without the hard work of the blood, it is difficult for us to keep the body in normal temperature, pH, osmotic pressure and so on. Blood leukocytes and a variety of immune substances have a protective effect on the body when the bacteria invade the body