中线组织剂量

VOA标准英语2012--Studies Link Bee Decline to Insecticide

Studies Link Bee Decline to Insecticide Billion-dollar bees Bees pollinate the flowers that become fruits, nuts and vegetables. The work these insects do is worth about $18 billion a year to U.S. farmers. But honeybee colonies in the United States ha

发表于:2018-12-16 / 阅读(32) / 评论(0)

VOA标准英语2012年(三月)

Day-Old Mice Grow Back New Heart Tissue After Injury

When humans have a heart attack, heart muscles die after being cut off from their blood supply. But what if the heart could grow new muscle to replace the dead tissue? Some amphibians can regrow body parts, even entire limbs. But humans and other hig

发表于:2018-12-16 / 阅读(215) / 评论(0)

VOA标准英语2011年(三月)

英语节奏训练18

18. Twelve Cans of Tuna Fish Rag Twelve cans! Twelve cans! Twelve cans of tuna fish. Twelve cans. How many cans? Twelve, twelve. Did you say twelve? Yes, I said twelve. Twelve cans of what? Twelve cans of fish. Twelve cans of fish? Yes, fish, yes, fi

发表于:2018-12-25 / 阅读(100) / 评论(0)

英语节奏训练

VOA标准英语2012--Scientists Regrow Tissue Killed During Heart Attack

Scientists Regrow Tissue Killed During Heart Attack U.S. scientists have done what was once considered science fiction - regrown heart muscle to replace tissue that was killed off in a heart attack. It's the latest advance in the field of regenerativ

发表于:2019-01-14 / 阅读(54) / 评论(0)

VOA标准英语2012年(二月)

VOA标准英语2010年-Blood Vessel Disease Linked to Dementi

Researchers have identified a link between dementia and the brain damage that can occur in older people with high blood pressure and other forms of cardiovascular disease. High blood pressure, high cholesterol, and other conditions that affect blood

发表于:2019-01-14 / 阅读(69) / 评论(0)

VOA标准英语2010年(十一)月

60秒科学:Beating Heart Tissue from Stem Cells

Beating Heart Tissue from Stem Cells In a study in the journal Science, researchers explain how they used mouse embryonic stem cells and microchip technology to create heart muscle tissue that actually beats. Cynthia Graber reports One of the goals o

发表于:2019-01-30 / 阅读(82) / 评论(0)

60秒科学

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