希尔(1838~1916,出生于加拿大的美国铁路建筑家、金融家)

This is Scientific Americans 60-Second Science. Im Steve Mirsky. Got a minute? To keep your car purring, you have to change the oil. Such maintenance produces eight billion gallons of used motor oil annually. Some waste oil does get re-refined to pro

发表于:2018-12-24 / 阅读(72) / 评论(0) 分类 Scientific American(三)月

Black Holes What is a black hole? Well, it's difficult to answer this question, since the terms we would normally use to describe a scientific phenomenon are inadequate here. Astronomers and scientist

发表于:2018-12-31 / 阅读(48) / 评论(0) 分类 有声英文阅读

What is a black hole? Well, it's difficult to answer this question, since the terms we would normally use to describe a scientific phenomenon are inadequate here. Astronomers and scientists think that a black hole is a region of space (not a thing) i

发表于:2019-01-02 / 阅读(33) / 评论(0) 分类 双语有声阅读

At last, astronomers had a map of our galaxy. A panorama of the Milky Way, it would never be possible to see from Planet Earth. 27,000 light-years from our solar system is the centre of our galaxy. If we were ever going to have a chance of seeing a b

发表于:2019-01-23 / 阅读(26) / 评论(0) 分类 探索与发现2013年

December 29 12月29日 Read it! 读读看! Oh, no! Everyone is getting sick. 糟糕!大家都生病了。 Taylor has a headache. 泰乐头痛, She is also starting to cough a lot. 也开始不断咳嗽。 Alex's stomach doesn't feel very good. 亚

发表于:2019-01-23 / 阅读(34) / 评论(0) 分类 大家说英语

【原文】 Black HolesWhat is a black hole? Well, it's difficult to answer this question, since the terms we would normally use to describe a scientific phenomenon are inadequate here. Astronomers and scientists think that a black hole is a region

发表于:2019-02-16 / 阅读(30) / 评论(0) 分类 英语听力广播—Listening