单词：Prionodontaceae
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This is Scientific American's 60-Second Science. I'm Cynthia Graber. This will just take a minute. Conditions such as mad cow disease are caused by abnormally shaped proteins, called prions. Prions spread by causing other, normal proteins to misfold
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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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Spring has just sprung in the Northern Hemisphere, and that means an annual natural spectacular is just a couple of weeks away, deep in the heart of Texas. There are no other natural wonders in the rugged Texas Hill Country. No awe-inspiring canyons,
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By Ernest Leong Washington 19 March 2007 watch Vaccine report Some U.S. state lawmakers are fighting a mandate requiring certain vaccinations for children, saying it encourages undesirable behavior. Getting vaccinated has become a more complicated pr
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Part five 第五章 Endodontic Treatment 根管治疗法 There's a patient with severe pain in the waiting room, Doctor. 医生，在候诊室有一个病人牙痛得很厉害。 Take an X-ray and ask him to sit down in treatment room number two. 给她
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