氟化硒(IV) {四氟化硒}

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(111) / 评论(0)

Scientific American(十二)月

求职英语一part f_iv-x_new

[00:00.00]9.I:What do you think is the relationship [00:02.27]你认为 [00:04.55]between the subjects you have taken and the job you are seeking? [00:06.99]你曾修读的科目和你申请的这份工作有何关系？ [00:09.43]A:I have taken cour

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求职英语

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

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口腔临床英语对话

unit34 The American Civil War 美国内战

Sorry,there is not text temporarily, Please help tingroom to look for it! 如果您能找到更好的听力原文，请发贴到听力原文收集区，您将会获得10到30积分的奖励! Thank you！

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午后咖啡

吸收金属原料的植物有助于抗癌药品的研制

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科技之光

闲谈英语-Receiving Visitors(2)

A: I'm really glad that you came to see me. B: I had to. I was missing you a lot. A: I was missing you too. B: So, why haven't you visited me? A: I've actually been busy lately. B: What have you been doing? A: I've just been working really hard. B: I

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英语闲谈

闲谈英语-Receiving Visitors(1)

A: Thanks for coming to see me today. B: It's no problem. I was really missing you anyway. A: I missed you too. B: Why haven't you tried to come see me then? A: I've been really busy. B: Doing what? A: Working. B: I would've come to see you sooner, b

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英语闲谈

VOA标准英语2011-Study Shows Vitamin E Increases Prostate

Study Shows Vitamin E Increases Prostate Cancer Risk A number of medical studies over the years suggested that vitamin E, taken as a dietary supplement, might help prevent prostate cancer. But new research finds not only that the earlier studies were

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VOA标准英语2011年(十月)

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

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VOA标准英语2010年(十)月

VOA标准英语2011--Indian PM Calls on Anti-Corruption Activ

Indian PM Calls on Anti-Corruption Activist to End Hunger Strike 印度总理呼吁反腐分子停止绝食 India's Prime Minister Manmohan Singh has called on activist Anna Hazare to end his hunger strike being conducted to call for tougher anti-cor

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VOA标准英语2011年(八月)

VOA标准英语2013--Scientists Suggest Adding Selenium to Diets in Malawi

Scientists Suggest Adding Selenium to Diets in Malawi The study, which was published in the journal Scientific Reports, found that most Malawi soils do not have an adequate amount of selenium required for human nutrition. In the report, researchers a

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VOA标准英语2013年(三月)

15 of the Greatest Motivational Quotes

15 of the Greatest Motivational Quotes Below are 15 of the greatest motivational quotes, enjoy: 1. I run on the road, long before I dance under the lights. I hated every minute of training, but I said, Dont quit. Suffer now and live the rest of your

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阅读空间

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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科技之光

2006年VOA标准英语-Civil Rights Activist Dubious of Darfur De

By Nico Colombant Abidjan 05 May 2006 Members of Sudan Liberation Army, SLA, walk out of meeting in Abuja, Nigeria, Friday A top civil rights activist for Sudan's Darfur region is dubious about the ne

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2006年VOA标准英语（五月）

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

发表于:2019-02-02 / 阅读(86) / 评论(0)

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第二卷（共 55分）四、单词拼写（共 10小题，每小题1分；满分10分）根据下列句子所给单词的首字母，在句子右边的横线上，写出空缺处各单词的正确形

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实用英语

2000年春季高考英语—第二卷IV

2000年普通高等学校春季招生全国统一考试（北京、安徽卷）英语 National Matriculation Engkish Test(NMET 2000) 第二卷（共55 分） IV.单词拼写（共10小题，每小题

发表于:2019-02-06 / 阅读(167) / 评论(0)

实用英语

VOA标准英语2011--Activists Push for Right to Counsel in US Civil Cases

Activists Push for Right to Counsel in US Civil Cases People who are charged with crimes in the United States have a constitutional right to have an attorney provided to them by the government, if they can not afford one on their own. Legal advocates

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VOA标准英语2011年(十二月)

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