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Whats So Special About A Sharp Knife? Everyone knows that a sharp knife cuts better than a dull one, but do you know why, exactly? The purpose of the cutting edge of a knife is to concentrate the force thats being applied at the handle. When you push
英语听力文摘 English Digest
By Carol Pearson Washington 22 August 2007 High blood pressure, or hypertension, is a disease usually associated with adults, but children can get it too and can have serious health problems because of it. A new study is now calling for pediatricians
2007年VOA标准英语（八月）
Capping Stack deploys from on board the Transocean Discoverer Inspiration on the MC 252 location 11 July 2010 Oil company BP is considering a so-called static kill to seal off its damaged Macondo well in the Gulf of Mexico, even as plans go forward t
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VOA常速英语2014--High Blood Pressure in Young Adults Could Lead to Heart Disease 青年时血压高能导致心脏病 February is heart health month, and a new study that provides clues to young people about keeping their hearts healthy. The stud
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A: Have you been feeling OK lately? B: My coach wants you to check my blood pressure. A: Has anyone ever told you that you had high blood pressure? B: I dont have any symptoms of high blood pressure. A: People with high blood pressure seldom know the
英语情景对话-健康
By Melinda Smith Washington 12 September 2007 A recent study indicates that a disturbing number of American children with high blood pressure go undiagnosed. The study has prompted discussion worldwide about whether hypertension among children is jus
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