单词：teratogenic zone
单词：teratogenic zone 相关文章
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
VOA标准英语2011年(三月)
[00:00.00]Exercise 2.1 [00:05.41]So,tell me about your trip to Egypt. [00:08.71]How high are the pyramids [00:11.03]They are huge! [00:13.06]One of them-the Great Pyramid of Khufu- [00:16.74]is 137 meters high. [00:19.97]How far are the pyramids from
北师大版初中英语八年级上
Broadcast: Feb 13, 2003 Demand for electricity is growing in Mexico, but the state-owned oil company, known as Pemex, is reducing the amount of natural gas it can provide for electrical generation. Th
VOA2003（上）-国际时讯
By Bill Rodgers Washington 19 May 2008 The Green Revolution is a good example of how technological advances can have a dramatic effect on economic development - in this case on food production. Other technological innovations are helping to improve a
VOA标准英语2008年（五月）
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
VOA标准英语2010年(十一)月
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
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