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This is the VOA Special English Health Report. An allergy is an unusually strong reaction to a substance. Many things can cause allergies. The most common cause is pollen. Trees usually produce pollen in the spring, grasses in the summer and weeds in
VOA慢速英语2007年（七）月
Children's Asthma Not Eased by Anti-Reflux Drug Seventeen-year-old Alaina Kvapil was diagnosed with asthma when she was 13. When you have an asthma attack, your airways actually close up and people dont realize that you cant breathe, you cant get the
VOA标准英语2012年(一月)
This is the VOA Special English Health Report. Chronic obstructive pulmonary disease, or C.O.P.D., affects more than two hundred million people around the world. The World Health Organization says at least five million people died from it in two tho
VOA慢速英语2008年（一）月
New Study Could Change Treatment For Asthma Most adults who have mild or moderate asthma are told to use their inhalers twice daily, even if they don't have symptoms. The medicine in those compressed-air inhalers are corticosteroids, which open a per
VOA标准英语2012年(十一月)
Nowadays, it's less common to use placebos this way because of ethical concerns. 如今，通过安慰剂的这种方法已经不常见了，因为涉及到道德问题。 If it's possible to compare a new drug against an older version, 只要将新药
TED演讲教育篇
New Study Could Change Treatment for Asthma Global treatment guidelines for asthma could change as a result of a study led by a researcher at the University of Texas Medical Branch. Most adults who have mild or moderate asthma are told to use their i
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