27. Scientific Theories In science, a theory is a reasonable explanation of observed events that are related. A theory often involves an imaginary model that helps scientists picture the way an observed event could be produced. A good example of thi

发表于:2018-12-08 / 阅读(311) / 评论(0) 分类 新概念优美背诵短文50篇

The Road to Happiness 幸福之道 If you look around at the men and women whom you can call happy, 只要你观察一下周围那些你可称之为幸福的男男女女, you will see that they all have certain things in common. 就会看出他们都

发表于:2018-12-31 / 阅读(41) / 评论(0) 分类 英语小达人

SCIENCE IN THE NEWS - Evolution and Intelligent Design By Jill Moss Broadcast: Tuesday, March 15, 2005 (MUSIC) VOICE ONE: This is SCIENCE IN THE NEWS, in VOA Special English. I'm Sarah Long. VOICE TWO

发表于:2019-01-04 / 阅读(53) / 评论(0) 分类 科技之光

SCIENCE IN THE NEWS - Stephen Hawking and Black Holes / Quantum Theory By Caty Weaver Broadcast: Tuesday, August 17, 2004 VOICE ONE: This is SCIENCE IN THE NEWS, in VOA Special English. I'm Bob Dought

发表于:2019-01-07 / 阅读(72) / 评论(0) 分类 科技之光

SCIENCE REPORT – January 31, 2002: Hubble Improvements By Paul Thompson 1993 service flight This is the VOA Special English Science Report. American space agency astronauts will soon replace much of

发表于:2019-01-07 / 阅读(47) / 评论(0) 分类 科技之光

[ti:UNIT 4 Look into Science! Lesson 26: One Wet Danny?] [0:00.493]UNIT 4 第四单元 [0:02.588]Look into Science! 走进科学! [0:04.930]Lesson 26: 第26课: [0:06.840]One Wet Danny? 丹尼湿透了吗? [0:09.028]THINK ABOUT IT! 想一想 [0

发表于:2019-01-09 / 阅读(177) / 评论(0) 分类 河北教育初中英语(初中起点)八年级下册