美国有线新闻 CNN 地震夷平意大利小镇 解读地震预警系统

play pause stop mute unmute max volume 00:0002:36repeat repeat off Update Required To play the media you will need to either update your browser to a recent version or update your Flash plugin. The mayor of Amatrice, which is located in central Italy

美国空军飞行员的严重短缺

US Air Force Has Severe Shortage of Pilots 美国空军飞行员的严重短缺 The United States Air Force is reporting a shortage of pilots of fighter airplanes. The lack is so severe that some generals say it may affect the services ability to car

事实：金星上一天竟比金星上一年要长-A Day on Venus is Longer Than a Year on Venus

Pre-Listening Vocabulary revolution: to go around something (Earth revolves around the Sun.) rotation: the spinning of something (Venuss rotation is backwards.) axis: a real or imaginary line that something rotates on retrograde: in a backwards movem

CNN 2011-12-10

CNN News from here Atlanta, Georgia straight to your classrooms, Im Carl Azuz, this is CNN Student News. Today were starting something called a payroll tax. Heres the deal on the payroll tax from A to Z. Americans have been getting a break on their f

英文书摘精选 多年前,一年长达400天

Years Ago, The Year Was 400 Days Long 多年前，一年长达400天 Don: Yaeuml;l, do you notice the days changing length over the course of the year? 东：雅瑶，你有注意到一年中每一天的长度在改变么？ Yaeuml;l: Sure, Don, it s

英文书摘精选 智利地震如何使地球一天时间缩短

The massive earthquake that struck Chile in February 2010 might have shortened Earth's day by 1.26 microseconds, according to calculations by a NASA scientist. An EarthSky Facebook friend asked us how. And the answer is for the day to get shorter, Ea

9-14 用于探索太空的发明：人造卫星

Inventions for Exploring Space: Artificial Satellites Sputnik Ⅰ was the first artificial satellite. It can be described as an aluminium 1 sphere with a diameter 2 of 58 centimetres and weighing 83.6

英语听力文摘 English Digest 518、地球同步卫星（二）

A Stationary Satellite, part 2 A geostationary satellite orbitsthe planet at the same rate as the planet rotates, so the satellite is always over the same patch of ground. Cool! you say. Id like to have one of those about twenty feet over my house. S

Earth and Sky:Galactic Rotation 银河系自转

Galactic Rotation 银河系自转 Astronomers calculate there is ten times more matter in our Milky Way galaxy than we can actually see. Discover how the orbital motions of stars in the galaxy reveal dark matter -- on today's Earth and Sky. JB: I'm Joel

电信专业英英词典C-3

City Code - Some foreign countries require you to dial a city code before the phone number you are trying to reach. Clamp - A circuit that removes the energy dispersal signal component from the video

电信专业英英词典G-1

Gain - This is an increase in signal power, due to a boost from an electronic device. Garbage - These are unwanted characters that appear because of either incorrect settings or noise. Gate - These ar

SSS 2011-05-06

This is Scientific American's 60-Second Science. I'm Karen Hopkin. This will just take a minute. Albert Einstein wins again. A new study has confirmed another prediction of his theory of general relativity. The corroboration appears online in the jou

与美国小学生一起学英文第12册 第11期:水星

Mercury 水星 Which planet is the closest to the sun in the solar system? 太阳系中哪颗行星离太阳最近？ It is Mercury. It is also the smallest planet in the solar system. 水星。它也是太阳系中最小的行星。 How small is Mer

全球钟表今日将加“一闰秒”

Airlines, trading floors and technology companies are braced for chaos today as world timekeepers prepare to add a leap second to global clocks. 世界钟表今天要给全球的钟表加一闰秒，因此航班、交易所、科技公司正在为即将

英语听力：自然百科 地球自转的奥秘

Well, the story of the earth spin goes back all the way to the origin of the solar system, four and a half billion years ago. The solar system started out as a cloud of gas and dust. And these gas and dust clumped together to form the sun and the var

英语听力：自然百科 地球力场 Earth's Force Field—8

Easily confused by this idea, there has a big thawed iron inner core, so that I think it's just the bar magnet, just permanent magnet frozen in nad, and that's where causes all the magnetic field. But it's too hot inside the Earth, that can't happen

英语听力：自然百科 神奇水世界 Water-13

But as it grew, the Khmer Kingdom faced the stumbling block. When the monsoon finished each year, the fish and water would vanish. So each year, the inhabitants were plunged into drought and hunger. The Khmer rules off the challenge magnificently. Th

英语听力：探索发现 2014-07-20 BBC 地平线：陨石的真相-30

It came in in the daytime sky out of the Sun. Weve got telescopes looking out there for these objects, but they only work at night. Radar doesnt help either because to really use radar to find these objects above the atmosphere, you have to know exac

英语听力：自然百科 金星和水星旅行指南 Venus and Mercury-4

Many aspects, like its geological past, are a mystery. But some things we do know, this lonely planet has a strange sense of keeping time. Once you arrive, you have to reset your watch for a time zone like no other. It has such an unusual orbit and r

地球白天时间越来越长 670万年增加1分钟

Earth's days are getting longer but you're not likely to notice any time soon it would take about 6.7 million years to gain just one minute, according to a study published last Wednesday. 据上周三公布的一份报告显示，地球的白天时间正