单词：can lining enamel
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Every cloud has a silver lining, says the optimist. It follows naturally, then, that the pessimist must favor looking for the rusty lining. Just as the optimist can always find reasons for hoping that bad situations can improve, so the best pessimis
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Occlusal wear - loss of enamel on the biting surface of the teeth due to the abrasive action of chewing natural unprocessed food. Odontoblast process - the extension of the cy lasm of an odontoblast w
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KORVA COLEMAN, HOST: Seanan McGuire published her first book in 2009, and since then, she's written more than two dozen novels across multiple fictional universes, from urban fairy fantasy to zombie horror. And this year, she achieved her lifelong dr
2018年NPR美国国家公共电台7月
They are shaped like little chisels. 它们的形状就像凿子一样。 These cutting teeth always keep their sharp, chisel-like edge, for the front of each tooth is formed of a very hard stuff called enamel, while the rest of the tooth is made of
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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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