单词 | permanent tooth |
释义 | permanent tooth permanent tooth n.(名词)One of the second set of teeth in mammals that grow as the milk teeth are shed. Human beings have 32 permanent teeth.恒齿,恒牙: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 |
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