【无机化学】氟化亚铬

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(363) / 评论(0)

Scientific American(十二)月

奥运28大项第47课 Synchronized Swimming 花样游泳 01

北京奥运28大项参与，竞争，分享，进步 Synchronized Swimming 花样游泳英文原文 The events of Synchronized Swimming are Solos, Duets, Teams and Free Combination. Competitors in Synchronized Swimming younger than fifteen (15) years of age (on December

发表于:2018-12-05 / 阅读(384) / 评论(0)

奥运28大项比赛

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(327) / 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(345) / 评论(0)

口腔临床英语对话

奥运28大项第48课 Synchronized Swimming花样游泳 02

北京奥运28大项参与，竞争，分享，进步 Synchronized Swimming 花样游泳 MUSIC ACCOMPANIMENTS 音乐伴奏英文原文 The Sound Centre Manager shall be responsible for the securing and properly presenting the accompaniment for each routine. For FINA competiti

发表于:2018-12-30 / 阅读(311) / 评论(0)

奥运28大项比赛

英语语法：173 Funny Homophones

Grammar Girl here. Today's topic is words that can get you into trouble. Guest-writer Bonnie Trenga writes: Once upon a time, some mistaken citizens stood up for American principals, p-r-i-n-c-i-p-a-l-s. Across the Atlantic, a nutty queen sat on her

发表于:2019-01-02 / 阅读(447) / 评论(0)

英语语法 Grammar Girl

VOA标准英语2009年-New England Town Brings Rockwell's Chr

Every year around Christmas, Stockbridge, a small town in western Massachusetts, puts on a display unlike any other in the US. The celebrated American artist Norman Rockwell, who passed away some 30 years ago, used the New England town as the setting

发表于:2019-01-13 / 阅读(317) / 评论(0)

VOA标准英语2009年(十二月)

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(334) / 评论(0)

VOA标准英语2010年(十)月

VOA标准英语2010年-Omo River Dams in Ethiopia: Blessing o

Ethiopia will accomplish the construction at any cost whether donors continue funds or not. The giant Gibe III dam, now being built on the Omo River in southwestern Ethiopia is a boon for some, a problem for others. Supporters say it will provide ele

发表于:2019-01-14 / 阅读(366) / 评论(0)

VOA标准英语2010年(九)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

发表于:2019-01-30 / 阅读(306) / 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(261) / 评论(0)

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adenosine triphosphate sulfurylase

after-treatment with tonnin