氟硼酸钡

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(57) / 评论(0)

科技之光

VOA慢速英语2010年-Education Report - A High School Offer

This is the VOA Special English Education Report. Most American schools have boys and girls in the same classroom. But a public high school in the small, rural town of Boonsboro, Maryland, offers a special program. Top students in the ninth and tenth

发表于:2019-01-12 / 阅读(147) / 评论(0)

2010年VOA慢速英语(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(69) / 评论(0)

VOA标准英语2010年(十)月

职业技术英语口语第87期:环境问题法规

Legislation 法规 A: Has your company been affected much by government legislation? A:政府法规对你们公司影响大吗？ B: Yes, we have. We've had to clean up our production process a lot to meet tough government standards. B:是。为了严格

发表于:2019-01-14 / 阅读(40) / 评论(0)

职业技术英语口语

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(60) / 评论(0)

英语单词荟萃

VOA标准英语2010年-No Girls Allowed: Public School Tries

In public high schools across America, large classes containing a mix of both boys and girls are the norm. However, in a move that's drawing high marks from students, one public school in Maryland has decided to buck that tradition. Class experimentA

发表于:2019-02-05 / 阅读(60) / 评论(0)

VOA标准英语2010年(十一)月

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Acalypha hainanensis

accurate thermometry

acoustic imaging by Bragg diffraction

apicoposterior branch

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