氟化铬(II) {二氟化铬}

A Day at the Races (II)

American Old-time Radio Classic Favorites A Day at the Races (II) Mary: Hello, Benita! Benita: Hello, Mary. Hello, Jack. Why Ronnie, look who's here! Jack: Hello, Ronnie, aren't you surprised at meeti

发表于:2018-11-28 / 阅读(165) / 评论(0)

疯狂英语2004年

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(127) / 评论(0)

Scientific American(十二)月

温馨夜读II PART1 13.You Are Not Alone

[00:01.19] 13.You Are Not Alone [00:04.90]Since I was 12 years old, Ive suffered with a condition called Compulsive Hair Pulling. [00:11.11]The physical devastation was severe, but the emotional damage was worse. [00:17.31]When I was young, no one, i

发表于:2018-12-03 / 阅读(106) / 评论(0)

自然百科2008年

美国英语听力80篇1 Lesson02

[00:09.95]Six weeks ago, the movie Erin Brockovich opened the United States. [00:16.95]So far, it has earned at least 100,000,000 dollars. [00:22.47]It tells a true story about a young woman who helped people in a California town gain money from an e

发表于:2018-12-03 / 阅读(105) / 评论(0)

标准美语发音的13个秘诀 CD4

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(93) / 评论(0)

科技之光

美国有线新闻 CNN 水中何种元素引发癌症?

Could an element commonly found in Americans` tap water caused cancer? A nonprofit environmental group is sounding the alarm about something called chromium-6. The U.S. government says high levels of it in the air can be carcinogenic, meaning they ca

发表于:2018-12-20 / 阅读(82) / 评论(0)

CNN美国有线新闻2017年2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

发表于:2018-12-27 / 阅读(124) / 评论(0)

口腔临床英语对话

【电影预告片填空】生存者

Help! There's someone hurt! - What are you hearing, Sullivan? - According to first responders it was a bomb. - How many? - Four of yours and five passersby. - Have anyone claimed responsibility? - We found this. - Do you think she's dead? - We can't

发表于:2018-12-28 / 阅读(82) / 评论(0)

英文电影预告片填空

多功能英语阅读38 The Towers(II)

发表于:2019-01-02 / 阅读(89) / 评论(0)

多功能英语阅读

生活希望我们学会的50条人生道理II

11. People who are meant to be together will find their way back to each other. They may take detours, but theyre never lost. 11. 命中注定要在一起的人终究会找到通向对方的路。虽然途中可能会走不少弯路，但是他们绝对

发表于:2019-01-08 / 阅读(97) / 评论(0)

励志英语

你可否记得：那些被遗忘的人生哲理II

11.Having a plan, even a flawed one at first, is better than no plan at all. 先制定计划，即使这个计划还有缺陷也比没有任何计划要好。 12.What you do every day matters more than what you do every once in a while. 每天持之以

发表于:2019-01-08 / 阅读(138) / 评论(0)

励志英语

VOA慢速英语2013 AS IT IS 2013-05-23 Pollution Forces Residents from California Town

AS IT IS 2013-05-23 Pollution Forces Residents from California Town Hello. Im Jim Tedder in Washington. Welcome to a special edition of As It Is. Seventeen years ago, an American energy company paid hundreds of millions of dollars to settle legal cla

发表于:2019-01-12 / 阅读(101) / 评论(0)

2013年VOA慢速英语(六)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(104) / 评论(0)

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

发表于:2019-01-20 / 阅读(92) / 评论(0)

2018年科学美国人1月

pbs高端访谈:危险化学品六价铬污染美国饮水系统

JEFFREY BROWN:And now to part two of our investigative look at the safety of America's drinking water. Science correspondent Miles O'Brien reports on the toxic chemical made famous in the movie Erin Brockovich, its potentially harmful effect on human

发表于:2019-01-27 / 阅读(145) / 评论(0)

PBS访谈环境系列

pbs高端访谈:保护公民免受污染饮水的威胁

GWEN IFILL: Now NewsHour science correspondent Miles O'Brien begins a two-part look at America's drinking water, and the regulatory system that is supposed to guarantee its safety. His report is the result of a partnership with the Center for Public

发表于:2019-01-27 / 阅读(95) / 评论(0)

PBS访谈环境系列

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(105) / 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(99) / 评论(0)

英语单词荟萃

音乐咖啡厅:Con II Tuo Nome浸入灵魂的伤感

浸入灵魂的伤感Ivana Spagna ---《Con II Tuo Nome》意大利女歌手Ivana Spagna演唱的这首曲子令人感到一股莫明的悲伤，她那高亢浓郁的嗓音似乎不在在意你是否已处悲伤，仍然用一个个伤感的旋律和自符狠狠的把你推入哀伤与悲凉的旋涡，似乎这种莫明的伤感已经透入了

发表于:2019-02-08 / 阅读(156) / 评论(0)

音乐咖啡厅

英语听力文摘 English Digest 196、不锈钢的秘密

Why Stainless Steel Does Not Rust But Other Metals Do? 不锈钢（Stainless Steel）指耐空气、蒸汽、水等弱腐蚀介质和酸、碱、盐等化学浸蚀性介质腐蚀的钢，又称不锈耐酸钢。实际应用中，常将耐弱腐蚀介质

发表于:2019-02-24 / 阅读(129) / 评论(0)

英语听力文摘 English Digest

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学英语单词

accumulation of evidence

active optical fiber

adjoining area

anomalies of ocular muscle and tendon

ateria gastrica dextra

attached type parachute