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哺乳動物牙齒的基本構造

物，而前臼齒與臼齒則是用來研磨並切割食物。Mammals Basic Structure哺乳動物化石牙齒基本構造The mammalian tooth is made up of enamel.....more

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in the lower mandible erupt pointing forward and gradually grow upwards. The tooth-plates.....more

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and straight incisors, a distinctive humped neural spine and molar tooth-plates that wear.....more

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