血荒蔓延至全国，引发网友热议，网友的意见主要为，无偿献血，有偿使用，为何？报道称：八成以上的手术因缺血被迫推迟,有的医院储血量甚至不够一次手术使用,“血荒”被认为达到了十年来最严重的程度。用英语写一篇英语作文，谈谈你对无偿献血的看法。
　　As is obviously revealed in the bar chart above, over the past seven years (1998—2010), the proportion of free blood donation in clinical blood collection has been climbing and rocketed to over seventy percent in 2004, which is a welcome development to our whole society.
　　The implied meaning of the bar chart above can be illustrated as follows. To begin with, the increasing percentage indicates that great changes have taken place in terms of people's spiritual civilization. Most people want to make contribution to our society in one way or another is a way to realize self-value. The spirit of selflessness is more pervasive than ever before. What's more, the statistics betray that modern people, especially the young, have a better understanding of medical knowledge. Most people have abandoned their old idea that blood donation is most harmful to human body. In one word, our spiritual progress and rich medical knowledge have resulted in such a positive result.
　　In may view, effective measures should be taken to encourage free blood donation. First of all, a nation-vide education campaign should be launched to spread the necessity and knowledge of free blood donation. Besides, should be set up to protect those who donate blood. Only in this way can we create a harmonious and healthy society. (234words)
 

（实习编辑：朱琳）

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