单词：nitryl fluoride
单词：nitryl fluoride 相关文章
This is Scientific American's 60-Second Science. I'm Karen Hopkin. This will just take a minute. Beauty is only skin deep. And the beauty of shiny white teeth is even less deep. Because a new study shows that fluoride forms a thinner protective shiel
Scientific American(十二)月
07 牙病的预防与治疗 DATE=2-27-01 TITLE=SCIENCE IN THE NEWS #2113 - (1)Dental Health BYLINE=Nancy Steinbach VOICE ONE: This is Sarah Long. VOICE TWO: And this is Bob Doughty with Science in the
科技之光
Is it necessary to have cavities in the baby teeth repaired? 乳牙蛀成了洞还有必要补上吗？ If the baby teeth are going to fall out, I don't think that it matters if they become decayed. 如果乳牙是要脱落的，我想蛀了也没有关
口腔临床英语对话
By Derek Kilner Nairobi 16 June 2008 A battalion composed of troops from Sudan's northern and southern armies is set to deploy Tuesday to the disputed Abyei area on the country's north-south border. As Derek Kilner reports for VOA's East Africa bure
VOA标准英语2008年（六月）
Next Step After Carbon: Knowing Your Nitrogen Footprint This is the VOA Special English Agriculture Report. 这里是美国之音慢速英语农业报道。 A carbon footprint is the amount of carbon dioxide pollution that we produce as a result of o
2011年VOA慢速英语(四)月
The International Committee of the Red Cross said Gaza is suffering what it calls a full-blown humanitarian crisis. It said the death toll and number of injured is rising, the infrastructure of the Palestinian territory is shattered and civilians la
VOA标准英语2009年(一月)
Egyptian President Hosni Mubarak met on Monday with French President Nicolas Sarkozy and a European Union delegation to discuss ways to reach an immediate cease-fire in the Gaza Strip. While diplomatic talks have been unsuccessful in ending the viol
VOA标准英语2009年(一月)
A cluster of villages in China's Guizhou province has been plagued by an outbreak of disease that damages teeth and bones. Now, a new study by Chinese and American researchers puts the blame on polluted coal burned in home fireplaces. In small quanti
VOA标准英语2010年(十)月
Ah yes.The ol' fluoride rinse at the dentist. Not pleasant. But hey, good for your teeth, right? 没错，这是牙医洗牙用的含氟漱口水。确实够闹心的。但毕竟对你的牙齿有益不是吗? Well now materials scientists have been
2018年科学美国人1月
Teen Inventors Fight Tinnitus Irish teenagers Eimear OCarroll and Rhona Togher developed a treatment they hope will help people with tinnitus, an unpleasant ringing in the ears. Cynthia Graber reports Ever get a ringing in your ears after a loud blas
60秒科学
SCIENCE IN THE NEWS - November 26, 2002: Dental Health By Nancy Steinbach VOICE ONE: This is Steve Ember. VOICE TWO: And this is Bob Doughty with Science in the News, a VOA Special English program abo
科技之光
By Noel King Khartoum 12 November 2006 UN Emergency Coordinator Jan Egeland (L) with Martin Ojul, chairman of LRA negotiating team, in Sudanese town of Juba, November 11, 2006 The United Nations humanitarian chief is in southern Sudan for a meeting
2006年VOA标准英语（十一月)
By Cathy Majtenyi Nairobi 02 May 2006 A drying corn stalk in one of many farms in Adinefas in southern Eritrea The U.N. humanitarian representative for the Horn of Africa says Eritrea's government is
2006年VOA标准英语（五月）
今天我们要学的词是 fluoride. Fluoride 氟化物。The U.S. government is lowering the recommended amount of fluoride added to drinking water for the first time in more than 50 years. 美国政府50多年来首次降低饮用水建议添加的氟
英语单词荟萃
By Gilbert da Costa Abuja 16 October 2006 An international campaign to draw attention to the huge agricultural potential of the Sahel drylands of Africa is gaining ground, with a recent workshop in Niamey, the capital of Niger. The campaign seeks to
2006年VOA标准英语（十月）
By Rosanne Skirble Washington 01 April 2007 The wife of presidential candidate John Edwards renewed her fight against breast cancer this week. Elizabeth Edwards is one of three million women in the United States living with the disease. Of the 275,00
2007年VOA标准英语（四月）
When I was a little girl, I used to knit all the time. I used to knit jumpers and hats and scarves. I even used to knit little dolls sometimes: Snow White and the Seven Dwarfs for example. When you knit with two needles you can put the thread or the
原版英语对话1000个
Adrienne: So we just had Christmas and I see your knitting bag is out, did you knit anything for anyone for Christmas? Vivian: I started to knit for my granddaughters, but time caught up with me and I was making for them a poncho which consisted of t
原版英语对话1000个
By Lisa Schlein Geneva 15 June 2007 The World Food Program (WFP) says it has been able to successfully feed up to three million internally displaced people in Sudan's conflict-ridden province of Darfur. The organization says it has been able to do th
2007年VOA标准英语（六月）
By Phuong Tran Goz Beida, Chad 16 May 2007 In Chad, people are still arriving at camps to escape ethnic violence and bandit attacks along the Sudanese border. Humanitarian workers are often the first to reach out to people escaping from burning villa
2007年VOA标准英语（五月）