氟化钛(III) {三氟化钛}

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(175) / 评论(0)

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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

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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(166) / 评论(0)

口腔临床英语对话

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August the 9th is International Day of the World's Indigenous People. It is a time for the world to understand the problems of indigenous peoples around the world. The day was created by the United Nations General Assembly in 1994. It wanted to stren

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Bangladesh's government says all mutinous border guards have ended their rebellion. That word came after army tanks took positions outside the Dhaka headquarters of the border force. Some officials put the death toll from the two-day uprising at mor

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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

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VOA标准英语2010年(十)月

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

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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

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2006年VOA标准英语-Recent Studies Show Multitasking May Hurt a Per

By Ernest Leong Washington, D.C. 14 August 2006 watch Multitasking report It's a busy, fast moving world many of us live in, one that frequently requires us to multitask -- perform several tasks simultaneously. Some scientists say multitasking may n

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2007年VOA标准英语-Mali's Indigenous Dogon Tribe Struggles With 21

By Naomi Schwarz Dogon Country 04 January 2007 In this arid area near the eastern edge of Mali near the Burkina Faso border, the indigenous Dogon people struggle to maintain their culture and traditional ways of life since the end of the colonial er

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2007年VOA标准英语（一月）

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

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英语单词荟萃

2006年VOA标准英语-UN Indigenous Chief Urges Kenya To Protect Indi

By Cathy Majtenyi Nairobi 11 December 2006 A senior U.N. official concerned with the plight of indigenous communities around the world is in Kenya to assess the situation of pastoralist, hunter-gatherer, and other indigenous communities in the East

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2006年VOA标准英语（十二月）

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