单词：pas (para-aminosalicy lic acid)
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Lesson 15 Your passports, please. 请出示你们的护照。 Listen to the tape then answer this question. Is there a problem with the Customs officer? 听录音，然后回答问题。 海关官员有
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One of the leading researchers in the field of protein folding is David Baker of the University of Washington, in Seattle. 西雅图华盛顿大学的David Baker是蛋白质折叠领域研究者的领军人物之一。 For the past 20 years he and hi
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Acid Rain 酸雨 Damage from acid rain is widespread - not just in eastern North America, but throughout Europe, Japan, China, and Southeast Asia. Is the rain that's falling on your umbrella acidic? A listener's question -- on today's Earth and Sky. J
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Researchers Genetically Modify Corn to Increase Nutrition Researchers in the United States say they have discovered how to genetically engineer corn to produce a kind of amino acid usually found in meat. The result is a food with increased nutrition
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Hungry Lasagna So you made lasagna last night, and it was delicious. You saved the leftovers by wrapping aluminum foil over the top of the pan, and putting it in the fridge. When you get hungry today, you go to look for that lasagna, but it looks lik
英语听力文摘 English Digest
Helen: Hello, this is Real English from BBC Learning English, Im Helen. Jean: 大家好，我是董征。欢迎收听地道英语。 Helen: In Real English, we look at words and phrases that you might not find in your dictionary. Jean: 和汉语一样，英语语言里也是有好
地道英语在线听
How does acid deposition affect human health? We eat food, drink water, and breathe air that has come in contact with acid deposition. Canadian and U.S. studies indicate that there is a link between t
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SCIENCE IN THE NEWS - Killer Virus Brought Back From the Past, With the Hope to Avoid a New One By Cynthia Kirk and Caty Weaver Broadcast: Tuesday, October 18, 2005 (MUSIC) VOICE ONE: This is SCIENCE
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Ameloblasts- cells which differentiate from ectoderm and secrete enamel during tooth development. Amino acids - building blocks of proteins containing a carboxyl group (COOH) and an amino group(NH2) b
医务英语
Daily Life - Talking About a Past Event (C0095) A: Mike! Hey, how are you, man! Long time no see! B: Hey, Pat! Yeah, I havent seen you in ages! How are you? A: Im doing great! Its funny running into you like this. Just last week I ran into Matt as we
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Rights Group Challenges US Security Policy on Airline Passenger Lists Jim Malone A leading U.S. civil liberties group has filed a legal challenge to a program that seeks to bar people with suspected l
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This is the VOA Special English Economics Report. Greece's debt crisis has shaken investors in the United States and worldwide. They worry that it could spread far beyond Greece. On Thursday, a day after huge protests in Athens, the Greek parliament
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Richmond Re-examines its Confederate Past As the United States marks the 150th anniversary of the start of the Civil War, many Americans are re-examining the conflict, especially in Richmond, Virginia, former capital of the Confederacy. During the Ci
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By Birungi Machrine Kampala 26 November 2007 Attacks using acid are becoming more frequent in Uganda. Up to 2003, there were only 145 recorded attacks, but over the last three years, there have already been 87. Survivors often suffer from severe emot
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中国雇员Kathy忧心忡忡地去找美国同事Mark请教。 K: Hey Mark...do you mind if I ask you a couple of questions? Mark: No problem, I've got time. K: Great! Well, I'm going to Seattle for half a year. I'm attending a course at a universit
商务礼节美语
中国雇员Kathy要去美国考察，她找美国同事Mark了解美国文化，以免在待人接物的时候在礼节方面闹笑话。 K: If I'm using public transport...should I give up my seat if I see elderly people? M: Yes. I think that's pro
商务礼节美语
I love to eat sweets--candy, cookies, caramel apples--- everything. But I don't like getting cavities. Is there a way to eat lots of sugar without ruining your teeth? D: Interesting question. First, let's assume that you're not going to cut out sweet
英语听力文摘 English Digest
The Cleaning Power of Soft Drinks! 饮料的神奇清洁能力 Lets begin with a cleaning tip: If you have some tarnished or corroded brass that you want to clean, an old brass candlestick for example, you can use Coca-Cola, or any other cola soft dr
英语听力文摘 English Digest
Getting Rid Of Cavities 牙痛是继续忍受还是提前做好防护?爱护牙齿，每天的必修课。 M:Sorry,I'm late.I was brushing my teeth. W:Brushing your teeth?Right before 'A Moment Of Science'? Why? M:I'm trying to get rid of a cavity. W
英语听力文摘 English Digest
Acid Water Yal: What are you doing outside, Don? It's about to rain. Don: I'm setting out bottles. Y: I can see that. But why? D: For my new business venture. Bottled rainwater! Y: As in living plastic bottles out in the rain and then selling them as
英语听力文摘 English Digest