氟化钙透红外陶瓷

Telecommunication via Satellite

LESSoN EIGHT TEXT Telecommunication via Satellite At the beginning of the twentieth century, there were four powerful means of transmitting and receiving information over long distances: print, photog

发表于:2018-12-01 / 阅读(215) / 评论(0)

自考英语（一）78讲

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

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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

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科技之光

VOA标准英语2012--Traditional Shaman Ceremony Attracts New Yorkers

Traditional Shaman Ceremony Attracts New Yorkers Spiritual seekers and the merely curious participate in the ancient Incan ceremony, conducted by Jesus Aguilar, a Peruvian healer-priest called a shaman. Aguilar moved from Cusco, Peru, to New York wit

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VOA标准英语2012年(十月)

美国有线新闻 CNN 2014-03-19

welcome to our march 17 addition of cnn students news, I am coarl zoos, first up, voters in Crimea voted yesterday, and overwhelmingly chose to become part of Russia, the local government sending its delegation to Moscow to apply for that, Russia wel

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CNN2014年(三)月

科学美国人60秒 SSS Heat Sensor Has Snaky Sensitivity

One of the most exquisite heat sensors in the worldits not in some government lab. It's in the head of a snake. The pit viper, to be specific. They're incredibly sensitive. They beat any of the synthetic counterparts, even the most expensive semicond

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2017年Scientific American(二)月

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

70年的学习

Rob: Hello, I'm Rob and this is 6 Minute English and I'm joined this week by Finn. Hello Finn. Finn: Hello Rob. Rob: We are in a celebratory mood this week Finn aren't we? Finn: Yes we are. We have something to shout about - it's the 70th anniversary

发表于:2019-01-07 / 阅读(161) / 评论(0)

六分钟英语

VOA慢速英语How Early Treatment Can Limit the Spread of HI

Health Report - How Early Treatment Can Limit the Spread of HIV This is the VOA Special English Health Report. For people infected with HIV, the earlier they start treatment, the better -- and better not just for them. A new study shows that early tr

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2011年VOA慢速英语(五)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

TED演讲世上最无聊电视节目为何迷得无可救药(2)

We brought it on air in November 2009. 我们在2009年11月的时候播出了这个节目。 But no, this was far more attractive. 但其实，这节目火了起来。 This is the five biggest TV channels in Norway on a normal Friday, 这张图是挪威

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TED演讲娱乐篇

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

邀请函参考范文

邀请函参考范文 LETTER OF INVITATION Dear Sirs/Madam: We hereby sincerely invite you and your company representatives to visit our booth at The Continental Exhibition Center from April 15th to 20th 2006. Were one of the manufacturers specialize

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实用英语

展会英语邀请函参考范文

LETTER OF INVITATION Dear Sirs/Madam: We hereby sincerely invite you and your company representatives to visit our booth at The Continental Exhibition Center from April 15th to 20th 2006. Were one of the manufacturers specialized in sanitaryware, con

发表于:2019-01-21 / 阅读(125) / 评论(0)

实用英语

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

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(133) / 评论(0)

英语单词荟萃

展会英语辅导：邀请函参考范文

展会英语辅导：邀请函参考范文 LETTER OF INVITATION Dear Sirs/Madam: We hereby sincerely invite you and your company representatives to visit our booth at The Continental Exhibition Center from April 15th to 20th 2006. Were one of the man

发表于:2019-02-02 / 阅读(154) / 评论(0)

实用英语

广交会英文邀请函参考范文

Dear Sirs/Madam: We hereby sincerely invite you and your company representatives to visit our booth at The Continental Exhibition Center from April 15th to 20th 2006. 广交会英文邀请函范文 Were one of the manufacturers specialized in sanitar

发表于:2019-02-02 / 阅读(157) / 评论(0)

实用英语

2012年广交会邀请函英文

发表于:2019-02-11 / 阅读(137) / 评论(0)

实用英语

飞行员英语900句第25期:紧急情况通话术语(3)

We have multiple failures on the inertial reference system. We are no longer able to fly oceanic route. Request return for landing. 481. 我们有多个惯导失效，我们不能再跨洋飞行，申请返场着陆。 We do not meet GPS approach req

发表于:2019-03-10 / 阅读(416) / 评论(0)

飞行员英语900句

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学英语单词

accessory olivary nucleus