单词：erbium-doped yttrium lithium fluoride laser
单词：erbium-doped yttrium lithium fluoride laser 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
Hi, it's the All in the Mind podcast, I'm Lynne Malcolm. Today we go to Ireland to hear one man's story of living with bipolar disorder. Ian is in his mid-fifties, and despite his illness he has an enviable, almost idyllic life with his wife and thre
听一分钟英文-I
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
By Carol Pearson Washington 30 April 2008 Ten years ago, the U.S. Food and Drug Administration approved LASIK, eye surgery with a laser that enables people to see without glasses. But about five percent of LASIK procedures fail, and those patients ca
VOA常速英语2008年（四月）
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
SCOTT SIMON, HOST: One of the hottest gifts of the season is a little too hot, hot enough to catch fire. Hoverboards have been burning up because of problems with their lithium-ion batteries. And lithium-ion batteries are in a lot of things these day
英语语言学习
The United States Navy has demonstrated a new laser weapon operating in the Persian Gulf. The Laser Weapons System, or LaWS, is deployed on the USS Ponce transport ship. A live test firing of the weapon was recently carried out for Cable News Network
2017年VOA慢速英语(七)月
American inventor John Goodenough first started working on battery technology more than 40 years ago. Goodenough actually co-invented lithium-ion batteries in 1980. This eventually led to a revolution in the electronics industry because those devices
2017年VOA慢速英语(五)月
Parts of Chile are facing a growing water crisis. The Reuters news agency reports the government is taking steps to protect the countrys water supplies from mining operations. But for many years, the Chilean government approved water extraction right
2018年VOA慢速英语(九)月
Batteries That Last Forever Could Be Near 科学家研发可永久循环使用电池 We all have daily problems with technology, but how many of us can fix them? Mya Le Thai is a scientist studying at the University of California, Irvine. She recentl
2016年VOA慢速英语(五)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
Aircraft maker Boeing says commercial flights of the grounded 787 Dreamliner jets could resume within weeks. We are going to be dependent upon, as we move through the certification process, to determine when we actually get back in the air in terms o
英闻天下
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
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 Paul Sisco Washington 14 November 2007 At the McDonald Observatory in western Texas, a unique space program has been quietly underway for more than 30 years. It is called the Lunar Laser Ranging Program. VOA's Paul Sisco has more. Research scienti
VOA常速英语2007年（十一月）
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
As China Molybdenum announced it was buying one of Africas largest copper mines earlier this month one thing was soon clear: the acquisition was about far more than the red metal. 随着洛阳钼业(China Molybdenum)本月早些时候宣布正在收购
英语新闻
Chances are, you plug in your phone before you go to bed at night, thinking it's best to greet the morning with a fully charged device. 晚上临睡前，你可能会给手机充上电，想着第二天早上看到一部电量满格的手机。 Is th
英语新闻
Ytterby 瑞典小镇伊特比 yttrium 钇 (1794) erbium 铒 (1842) terbium 铽 (1842) ytterium 镱 (1907) 1794年在瑞典小镇伊特比的黑石中发现了化学元素钇，决定用 Ytterby命名该元素：yttrium。1842 年在该镇的黑石中发
实用英语
本期内容： Europe gave the world some of its top automakers, but it's losing out to China in the race to define the industry's future. China is the driving force in the business of electric vehicle batteries, which European leaders see as vital
夏说英语新闻晨读