氟硼酸钡

SSS 2010-12-29

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

发表于:2018-12-02 / 阅读(133) / 评论(0)

Scientific American(十二)月

Dental Health

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

发表于:2018-12-07 / 阅读(97) / 评论(0)

科技之光

口腔临床英语对话第29期:正畸治疗(2)

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

发表于:2018-12-27 / 阅读(129) / 评论(0)

口腔临床英语对话

VOA慢速英语2010年-Education Report - A High School Offer

This is the VOA Special English Education Report. Most American schools have boys and girls in the same classroom. But a public high school in the small, rural town of Boonsboro, Maryland, offers a special program. Top students in the ninth and tenth

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2010年VOA慢速英语(十二)月

VOA标准英语2011--Economy, Post Office Woes Force Iowa Tow

Economy, Post Office Woes Force Iowa Town off Map The United States Postal Service is facing unprecedented financial losses. Postmaster General Patrick Donahoe recently told lawmakers his agency needed government intervention by the end of the year t

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VOA标准英语2011年(九月)

VOA标准英语2010年-Coal Burning Linked to Fluoride Diseas

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

发表于:2019-01-14 / 阅读(107) / 评论(0)

VOA标准英语2010年(十)月

职业技术英语口语第87期:环境问题法规

Legislation 法规 A: Has your company been affected much by government legislation? A:政府法规对你们公司影响大吗？ B: Yes, we have. We've had to clean up our production process a lot to meet tough government standards. B:是。为了严格

发表于:2019-01-14 / 阅读(89) / 评论(0)

职业技术英语口语

科学美国人60秒 SSS 海狸牙齿的奥秘

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

发表于:2019-01-20 / 阅读(99) / 评论(0)

2018年科学美国人1月

SCIENCE IN THE NEWS - Dental Health

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

发表于:2019-01-30 / 阅读(108) / 评论(0)

科技之光

学个词 Learn a Word-VOA英语教学 2280-fluoride

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

发表于:2019-02-02 / 阅读(104) / 评论(0)

英语单词荟萃

VOA标准英语2010年-No Girls Allowed: Public School Tries

In public high schools across America, large classes containing a mix of both boys and girls are the norm. However, in a move that's drawing high marks from students, one public school in Maryland has decided to buck that tradition. Class experimentA

发表于:2019-02-05 / 阅读(109) / 评论(0)

VOA标准英语2010年(十一)月

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