氟化物-氯化物电解槽

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(108) / 评论(0)

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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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VOA标准英语2014--新的太阳能电池减少生产中对环境的危害

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牛津阅读树ORT-典范英语MP3下载 Phonics3 95 the mud bath

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发表于:2018-12-10 / 阅读(80) / 评论(0)

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纯正英语一分钟-bath

One of my favourite times of the day is bath time. I absolutely love taking a bath. Baths are so much better than showers. Having a bath is the most relaxing thing. Theres nothing better in life than sinking into a hot bath and letting the water take

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纯正英语一分钟

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Language Points 1.call out random numbers when someone is counting. 2.don't use punctuation. 3.reply to a long chat message with a k. 4.talk in a baby voice 5.click a ballpoint pen continuously 6.borrow someone's pen and then chew it 7.after taking a

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爆笑英语口语

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(107) / 评论(0)

口腔临床英语对话

学英语 22 A Spring Bath in Winter冬天泡温泉

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发表于:2019-01-02 / 阅读(132) / 评论(0)

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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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美国国家公共电台 NPR Retailers Plan To Clear Deadly Paint Removers From Shelves, As EPA Delays Ban

DAVID GREENE, HOST: Families across the United States are fighting with the federal government over a deadly chemical. Dozens of people have died from inhaling methylene chloride. This is an ingredient in common paint removers. NPR's Rebecca Hersher

发表于:2019-01-17 / 阅读(82) / 评论(0)

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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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Every winter some twenty million tons of salt are dumped on America's road.That sodium chloride melts the ice, so it prevents its formatin, helping to prevent accidents. But road salt has its downside. This is not very economical because salt is main

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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(94) / 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(81) / 评论(0)

英语单词荟萃

ESL Podcast 390 – Dietary Restrictions and Preferences

Tony: Who did you invite over for dinner Saturday? Carmela: I invited Keith, Sung, Stephanie, and Luis. Tony: You didnt! Carmela: I did. Why? Tony: Youre going to have a hard time cooking for them. Keith is a vegan and only eats food thats organic. S

发表于:2019-02-04 / 阅读(85) / 评论(0)

地道美语播客

ESL Podcast 510 – Taking a Shower or Bath

I spent the day helping my friend, Babbit, on his farm. When I got home, my wife said, You stink ! I headed straight for the shower . I ran the water , closed the shower curtain , and adjusted the showerhead . I worked the soap into a lather and scru

发表于:2019-02-05 / 阅读(120) / 评论(0)

地道美语播客

The Art of Doing Nothing

The Art of Doing Nothing Sure, we all know how to do nothing. We all know how to lay around and waste time. But many of us are too busy to do it much, and when we do it, our minds are often on other things. We cannot relax and enjoy the nothingness.

发表于:2019-02-09 / 阅读(218) / 评论(0)

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英语听书《海底两万里》第170期第12章一切都用电(3)

First off, I'll mention that at the bottom of the sea there exist veins of zinc, iron, silver, and gold whose mining would quite certainly be feasible. 首先，我对您说，海底有锌、铁、银、金等矿藏，开发并不是不可能的事。

发表于:2019-02-25 / 阅读(150) / 评论(0)

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