部分原因事因为哺乳动物的牙齿保存的十分完好。
通过对阿迪牙齿的分析表明阿迪平常所吃的食物是无花果以及其它水果、树叶和小型哺乳动物。
Analysis of Ardi's teeth points to a diet of figs and other fruit, leaves and small mammals.
裂齿，食肉齿适合于撕裂肉的牙齿，尤指食肉哺乳动物最后上前臼齿之一或第一个下臼齿。
A tooth adapted for tearing apart flesh especially one of the last upper premolar or first lower molar teeth in carnivorous mammals.
大白鲨的嘴巴和牙齿是一副功能强大的捕猎工具：猎物从小型鱼类到大型海洋哺乳动物。
Great whites have jaws and teeth that are perfect for a powerful chomp on prey ranging from small fish to large marine mammals .
这层外衣由哺乳动物的骨头和牙齿中（的材料）的磷酸钙构成。
This coating is made of calcium phosphate, (the material in) bone and tooth in mammals.
哺乳动物的第二套牙齿之一，它是在乳牙脱落时生长起来的。人类有三十二颗恒牙。
One of the second set of teeth in mammals that grow as the milk teeth are shed. Human beings have 32 permanent teeth.
金黄地鼠是哺乳动物，其中属于鼠类家族有大的牙齿正在不断增长，迫切需要对啃，以防止牙齿过度增长。
Hamsters are mammals which belong to the rodent family having large teeth that are continually growing necessitating gnawing to prevent the teeth from over growing.
近年在南岭以南的广东东江流域河源地区东源县上莞镇的碧寿洞中发现较丰富的古哺乳动物牙齿化石。
Abundant mammal teeth fossils have been found in the Bishou Cave of Shangguan Town of Dongyuan County, Heyuan in the Dongjiang River Valley, south of the Nanling Range, China.
传统的兽类分类学仅把哺乳动物毛皮特征作为参照，多以骨骼和牙齿作为分类依据，淡化了毛和毛被的分类鉴别作用。
Mostly bones and teeth used as a classification of traditional taxonomic zoology. Fur characteristics were counted as a reference, the characteristics of fur and hair were overlooked.
传统的兽类分类学仅把哺乳动物毛皮特征作为参照，多以骨骼和牙齿作为分类依据，淡化了毛和毛被的分类鉴别作用。
Mostly bones and teeth used as a classification of traditional taxonomic zoology. Fur characteristics were counted as a reference, the characteristics of fur and hair were overlooked.
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