单词：leadless enamel
单词：leadless enamel 相关文章
If you look up 'tea' in the first cookery book that comes to hand you will probably find that it is unmentioned; or at most you will find a few lines of sketchy instructions which give no ruling on several of the most important points. This is curiou
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This is the VOA Special English Development Report. Workers clean up lead paint at a building in Providence, Rhode Island in 2006. A new study shows that lead-based paint remains a worldwide threat to public health. Paint containing lead is a major
VOA慢速英语2009年（八）月
Don: Time to go again to the A Moment of Science mailbox. A listener writers: Dear Don and Yal, I've had a problem with cavities all my life, so I'm wondering if there are any new dental techniques or discoveries that can help me prevent tooth decay?
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Countless arguments have been waged over the superiority of one beverage over the other. But what does the scientific evidence say? 关于这两种饮料孰优孰劣的问题已经引发了无数争论。但是科学证据是怎样的呢？ George Or
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LONDON, June 16 (Xinhua) -- Drillings and fillings at the dentist's are always dreadful and make tooth decay treatment very unpleasant. But British scientists have developed a new approach of fixing tooth decay, which could get rid of all the drillin
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Big Red The first time we set eyes on Big Red, father, mother and I were trudging through the freshly fallen snow on our way to Hubble's Hardware store on Main Street in Huntsville, Ontario. We planned to enter our name in the annual Christmas drawin
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