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In the lungs the blood gets from the air-tubes the oxygen which it needs, 肺部的血液从气管中获取所需的氧气, and the air takes from the blood hurtful things which it must get rid of, and which we breathe out with our breath. 而空气则
World Heart Day was created by the World Heart Federation. Its aim is to inform people around the world that heart disease and stroke are the worlds leading causes of death. Over 17 million people die each year from these. Another main aim is to educ
[00:02.44]Unit 21 Human Biology Warm-up [00:07.39]Exercise 2 Listen and guess which parts of [00:11.04]the body of being described. [00:13.00]Which words help you to decide. [00:16.79]1 This organ weighs about a kilo [00:19.77]and is made up of two s
SCIENCE IN THE NEWS - Gifts of Life: Organ Transplants Reach Record Levels in U.S. By Cynthia Kirk Broadcast: Tuesday, August 09, 2005 (MUSIC) VOICE ONE: This is SCIENCE IN THE NEWS, in VOA Special En
Scientists are reporting a new way to identify when a heart transplant recipient is starting to reject the new organ. The new technique could help doctors ensure the success of more transplants. The human immune system is programmed to reject foreign
HEALTH REPORT - Scientists Learn More About How Cancer Spreads By Cynthia Kirk Broadcast: Wednesday, December 14, 2005 I'm Faith Lapidus with the VOA Special English Health Report. Scientists have lea