退化组织

[00:03.06]Hes very abrupt and changeful. 他还真是喜怒无常 阴晴不定 [00:03.38]By the river! 在河边! [00:07.78]What manner of man is he? 他是什么样的人? [00:09.82]Hes a good master. 他是个好主人 [00:12.06]Hes fine company, t

发表于:2018-12-07 / 阅读(101) / 评论(0) 分类 听电影学英语-简爱

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(236) / 评论(0) 分类 VOA标准英语2011年(三月)

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

发表于:2019-01-30 / 阅读(86) / 评论(0) 分类 60秒科学

The Virtual College In the fall of 1994, I arrived at my freshman dorm in my old station wagon filled with new clothes, too many shoes, and my proudest possession: a computer the size of a small refrigerator. Fortunately, I only had to lug1 my 50-pou

发表于:2019-02-04 / 阅读(50) / 评论(0) 分类 实用英语

第一,循构词法记忆单词。 在接触了很多的英语单词以后,大家很容易发现英语单词的背诵是有章法可循的,很多看起来十分陌生的词,经过仔细拆分或推敲后,对于其含义也能有所理解。这

发表于:2019-02-19 / 阅读(87) / 评论(0) 分类 雅思英语

很多考生在准备托福考试的时候,总会发现部分托福考试中的句子远远超出了自己的能力范围。对于这些长难句,当然要从语法的角度去完全把握。但是如果是在考试中遇到不能理解的句子时

发表于:2019-02-26 / 阅读(51) / 评论(0) 分类 托福英语