Special English 又叫“慢速英语”，是VOA 专为全世界非英语国家初学英语的听众安排的一种简易、规范的英语广播节目。该节目创始于50年代末期，是VOA 的专家们研究如何与世界各地的英语学习者进行交际的产物。它正式开播于1959年10月。当时只面向欧洲和中东，但由于这个节目适合许多国家英语学习者的需要，所以它的广播对象不久就扩大到世界其他地区，并很快在全世界范围内产生了广泛的影响。现在这个节目对欧洲、非洲和拉丁美洲每晚广播一次，对加勒比地区每晚广播一次（星期天除外），对东南亚广播次数最多，每天上午两次，晚上三次。
　　30多年来，VOA 为了办好Special English节目，进行了大量的调查研究工作，对播音速度、内容及用词范围都作了具体规定，基本上达到了既能为英语学习者提供信息，又不损害英语本身风格的目的，使之成为VOA 独具特色，拥有最大量听众的节目。
　

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2008.07.30

How the Heart Works

By Caty Weaver / Broadcast date: Wednesday, July 30, 2008

　　This is the VOA Special English Health Report.

　　We talked last week about the life of famed heart doctor Michael DeBakey. He died this month at age ninety-nine.

　　Today, we talk about the object of his work. The heart is a complex organ that starts beating a few weeks after conception. At this point the heart is a tube. In the coming days, it grows and bends into the shape of the heart.

Doctor Craig Smith uses a model to
explain the heart operation he
performed on former president
Bill Clinton in September 2004　　Later, it divides into four parts. As the heart beats, it pumps blood through these chambers and the blood vessels in the body. The body is estimated to have at least ninety-six thousand kilometers of blood vessels.

　　That is about the same as two and a half times around the Earth. But blood goes the distance in about twenty seconds on its way back to the heart. Each day the heart pumps about eight thousand liters of blood.

　　The blood feeds the brain and other organs with oxygen and nutrients. It also carries away carbon dioxide and other waste.

　　The heart pumps by expanding and contracting of muscle. In a healthy adult, the heart beats an average of seventy-two times a minute —— about one hundred thousand times a day.

　　A healthy adult heart is about the size of two fists and looks like a piece of red meat. But in overweight people, it can look yellow because of fat.

　　Rates of heart disease started growing sharply in the second half of the twentieth century. As machines did more and more work, people did less and less. Not only did physical activity decrease, but people started eating more and more processed foods.

　　Experts say a diet low in fats and high in fruits, vegetables, proteins and whole grains may help reduce the risk of heart disease. At least thirty minutes a day of physical activity, enough to work up a sweat, can also help. Also important to good health is a good night's sleep.

　　Cardiovascular disease is caused by disorders of the heart and blood vessels. It includes heart attacks, strokes and high blood pressure. The World Health Organization says there are three major causes: tobacco use, physical inactivity and an unhealthy diet.

　　The W.H.O. says cardiovascular disease is the world's leading cause of death. And it is predicted to remain that way unless more action is taken. Experts estimate that it could kill twenty million people a year by twenty fifteen. An estimated seventeen and a half million people died in the year two thousand five. Around eighty percent of them died in low- and middle-income countries.

　　And that's the VOA Special English Health Report, written by Caty Weaver. For more health news, go to www.voaspecialenglish.com. I'm Steve Ember.