美国有线新闻 CNN 通过查看空气质量指数保护健康

Wednesday's air quality index in Atlanta, Georgia, miles away from any of the fires, was unhealthy. In Chattanooga, Tennessee, it was 151. What exactly does that mean? SUBTITLE: What is the AQI? JENNIFER GRAY, CNN METEOROLOGIST: The one thing you nee

英语听力：探索发现 科学新发现：我们的大气层-20

As the balloons rise higer still,they face an attact by an invisible bombardment,radiation.Every day the Sun radiates a titanic amount of energy,some of them in the form of high energy of ultra violet rays.These rays packed a powerful punch ,and in t

SSS 2008-09-25

This is Scientific American's 60-Second Science. I'm Steve Mirsky . Got a minute ? Athletes have obviously been tempted to use performance enhancing anabolic steroids. Drug testing may discourage such use. But a new study finds that some of the perfo

英语听力：探索发现 科学新发现：我们的大气层-17

You could use the balloons not just to go to the edge of the space as we do now,but go all the way over the line, and actually to use balloons or airships to go all the way into space,space travel without rocket.Officially, the atmosphere ends and sp

英文书摘精选 How Does Ice Cool Drinks?冰块是如何使饮料冷却的?

Heres something we tend to take for granted: drop a few ice cubes into a glass of water at room temperature, and in a few minutes the water will cool. How does this work? 有件事情我们总觉得理所当然：室温下把一些冰块放入水中，

202 Useful Exercises for IELTS Side1-16-Ex2.8Lecture2

To be living at the start of the new millenium is to exist in the most advanced technological era in history. It is easy2 to forget that we are still surrounded by countless opportunities to get close to the earth, the sea and all the otherwonders of

英语听力文摘 English Digest 620、冰块如何使饮品冷却？

How Does Ice Cool Drinks? Heres something we tend to take for granted: drop a few ice cubes into a glass of water at room temperature, and in a few minutes the water will cool. How does this work? Heat is a measure of molecular activity: the faster a

SSS 2008-11-13

This is Scientific American's 60-Second Science. I'm Cynthia Graber. This will just take a minute. Weve heard that a mothers weight during pregnancy can influence the weight of her offspring. Now a study of rats shows that the fat content in a moms d

电信类英语词汇表大全-2

中文 英文 缩写 * （符） star (symbol) [美国]电气和电子工程师学会 Institute for Electrical and Electronic Engineers IEEE “请发码”信号

草莓的作用

Dieting isnt always easy, particularly if you have a sweet tooth. But by adding strawberries to your diet, you can enjoy a range of guilt-free dishes, drinks and snacks any time of day. Best of all, strawberries are low in calories, high in fiber, fa

WHO: Epidemics of Underweight and Overweight Growing

The World Health Organization (WHO) is calling for action to fight all forms of malnutrition(营养不良), including under-nutrition and obesity, which affect hundreds of millions of people worldwide. More than 60 world nutrition（营养） experts

VOA慢速英语2014 烟头转变成电池

Turning Cigarette Butts to Batteries 烟头转变成电池 If you see a person carelessly throw a cigarette to the ground, what are you likely to think? That depends. If you hate people throwing things on the ground, you might think, That person shou

美国国家公共电台 NPR House GOP Tax Plan Is Little Help To High-Tax States Like New Jersey

DAVID GREENE, HOST: Senate Republicans are expected to unveil their version of a tax overhaul today. Like the House bill that's already moving along, the Senate version is being touted as a way to keep more money in Americans' pockets. But for millio

3D Printer

Science Fiction-style replications, as seen in TV shows like Star Trek, might be a step nearer to becoming reality. Digital technology means it's now possible to make 3D objects from downloaded designs. Our reporter Li Dong has the details. These fun

英语听力：2013-08-18 《流言终结者》 第11季 第8集 完全爆炸手册—7

To be honest, we are totally in awe of people whose job is to face these in real life. But the grenade made into this A-to-Z is the Rocket Propelled Grenade, or RPG, because that is what gave us one of the best booms in Mythbusters history. Alright,

设计师为你讲述Gmail的新界面

Hi my name is Jason Cornwell . I'm user experience designer at Gmail. We have been hardworked to update Gmail with a new look.I'm excited to share with you some of the biggest improvements. 大家好 我是Gmail的用户体验设计师Jason Carmel。经

北京十三五生态环保目标 PM2.5年均浓度五年降三成

Beijing government has vowed that by 2020 the city's annual average density of fine particulate matter (PM2.5) will have decreased by 30% from that of 2015. 北京市政府日前承诺，到2020年，该市细颗粒物(PM2.5)的年均浓度将比2015年

VOA标准英语2010-Climate Changes Appear to Coincide with H

U.S. National Research Council calls for more exploration Rosanne Skirble | Washington, DC 08 April 2010 Photo: Smithsonian National Museum of Natural History Rick Potts has led excavations at early human sites in the East African Rift Valley, and cu

TED演讲:如何重新设计公寓建筑(2)

And then we decided to take New York as a test case, 后来我们决定拿纽约做实验案例， and we looked at Lower Manhattan. 研究曼哈顿下城。 And we mapped all the building area in Manhattan. 我们画出曼哈顿建筑区的地图。

TED演讲:如何重新设计公寓建筑(1)

When, in 1960, still a student, 1960年我还是学生时， I got a traveling fellowship 拿到出国留学的奖学金， to study housing in North America. 研究北美的住宅建筑。 We traveled the country. 我们游遍美国， We saw public