部分含氟聚合物

This is the VOA Special English Health Report. New York City wants to fight fat. The Board of Health has passed a ban on trans fats in all restaurants. Kentucky Fried Chicken sells a fried chicken fre

发表于:2018-11-27 / 阅读(603) / 评论(0) 分类 2006年慢速英语(十二)月

This is Scientific American's 60-Second Science. I'm Karen Hopkin. This will just take a minute. Are your car bumpers riddled with scars from encounters with tight parking spaces? Did the furniture movers scratch your floor? Wouldn't it be great if t

发表于:2018-12-24 / 阅读(202) / 评论(0) 分类 Scientific American(四)月

This is Scientific American's 60-Second Science. Im Cynthia Graber. This will just take a minute. Buildings consume about a third of the energy and two-thirds of the electricity in the U.S. Roofs are a good place to try to cut those figures. Because

发表于:2018-12-24 / 阅读(234) / 评论(0) 分类 Scientific American(三)月

Most of us blink without thinking. But people whove sustained strokes or combat injuries can lose their ability to blink. Which is important for lubricating and cleaning the eye. Surgery is an optiona small piece of muscle transplanted from the leg c

发表于:2018-12-24 / 阅读(200) / 评论(0) 分类 Scientific American(一)月

Lowering the Ceiling on Roof Energy Losses Buildings consume about a third of the energy and two-thirds of the electricity in the U.S. Roofs are a good place to try to cut those figures. Because traditional black asphalt roofs heat up in summer and s

发表于:2019-01-02 / 阅读(221) / 评论(0) 分类 60秒科学

By Lisa Schlein Geneva 20 April 2006 The International Federation of Red Cross and Red Crescent Societies is launching an appeal for $13.4 million for operations aimed at preventing the spread of bird

发表于:2019-01-07 / 阅读(209) / 评论(0) 分类 2006年VOA标准英语(四月)

This is Scientific American's 60-Second Science. I'm Steve Mirsky. Got a minute?. [Spray sound.] Killing bugs? No. [Spray sound.] Deodorizing the bathroom? No. [Spray sound.] Checking for explosives, yes. Because chemists at the University of Califor

发表于:2019-01-08 / 阅读(286) / 评论(0) 分类 Scientific American(九)月

Patients undergoing coronary bypass surgery need implants of new, healthy blood vessels. So do those who receive repeated hemodialysis due to kidney failure. The best option is to use the patient's own veins or arteries, but thousands of patients don

发表于:2019-01-08 / 阅读(212) / 评论(0) 分类 Scientific American(二)月

This is Scientific American's 60-Second Science. I'm Cynthia Graber. This will just take a minute. Solar cells convert sunlight to electricity. But they don't take advantage of all that solar heat, thereby missing out on the majority of the solar ene

发表于:2019-01-08 / 阅读(280) / 评论(0) 分类 Scientific American(四)月

Research Breakthrough for Biodegradable Tires? 研究人员研发完全可降解轮胎 Researchers say they have created a new synthetic rubber that could be used to make biodegradable tires. A team at Texas AM Universitys campus in the Gulf nation o

发表于:2019-01-12 / 阅读(189) / 评论(0) 分类 2016年VOA慢速英语(九)月

Some AIDS workers in Liberia say the way to stem the country's HIV rate is to urge women to wear female condoms. But others argue the female condom is impractical, and broader HIV/AIDS education is needed. As a health worker at an HIV/AIDS clinic in

发表于:2019-01-13 / 阅读(160) / 评论(0) 分类 VOA标准英语2010年(十二)月

'Smart' Bandages Could Heal Wounds More Quickly 智能绷带有助更快治愈伤口 Simple bandages are usually seen as the first line of attack in healing small to moderate wounds and burns. But scientists say new synthetic materials with embedded

发表于:2019-01-14 / 阅读(313) / 评论(0) 分类 VOA标准英语2016年(二月)

At first glance, the grass playing field at Mountain View Alternative High School in Centreville, Virginia, looks like any playing field at any high school in the country. But for a Sunday in August when most schools are usually still, there was a lo

发表于:2019-02-02 / 阅读(163) / 评论(0) 分类 英语新闻

WASHINGTON, Nov. 11 (Xinhua) -- The U.S. Food and Drug Administration (FDA) on Friday approved HEMACORD, the first licensed hematopoietic progenitor cells-cord cell therapy. HEMACORD is indicated for use in hematopoietic stem cell transplantation pro

发表于:2019-02-03 / 阅读(285) / 评论(0) 分类 英语新闻

Why Don't Snorers Wake Themselves Up? Anyone who's ever slept in the same room as a loud snorer knows how infuriating it is to have to suffer through all that noise while the offending party remains blissfully oblivious and asleep. Loud snorers can w

发表于:2019-02-04 / 阅读(189) / 评论(0) 分类 阅读空间

One of the buildings at Beijing's Palace Museum, or Forbidden City, most closely associated with imperial life is to undergo a major renovation based on traditional construction techniques, the museum announced on Friday. 北京故宫博物院周五宣

发表于:2019-02-06 / 阅读(204) / 评论(0) 分类 英语新闻

By Kurt Achin Kyoto 04 May 2007 Asia's economic development is a success story that has been decades in the making. But in the past decade, the region has become a key factor in a global imbalance marked by too much reliance on exports by countries i

发表于:2019-02-07 / 阅读(265) / 评论(0) 分类 2007年VOA标准英语(五月)

URUMQI, July 21 (Xinhua) -- More than 400 vehicles are stranded following rain-triggered mudslides that cut off multiple sections of a major road in northwest China's Xinjiang Uygur autonomous region, border police said Saturday. Several stretches of

发表于:2019-02-07 / 阅读(184) / 评论(0) 分类 英语新闻

雅思范文如何看待媒体 题目:Do the negative effects of some international media such as TV and magazine for example overweigh the positive effects? 范文:International media such as TV network and magazine always gives people in an inf

发表于:2019-02-08 / 阅读(232) / 评论(0) 分类 雅思英语

The brains behind QI, the BBC quiz show, explore where and when coffee originated. Desert fruitEvery cup of coffee you drink owes its existence to a fruit that grew wild in the Yemeni desert. The Sufi mystics of Yemen were the first to roast and brew

发表于:2019-02-18 / 阅读(222) / 评论(0) 分类 实用英语