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4周岁长多少颗牙齿
更新时间: 2020-11-04 00:00:00  

4周岁的孩子一般会长20颗牙齿,在6岁左右开始换牙,12岁左右牙齿全部替换完长出恒牙。

牙齿是一种很多动物都存在的结构,是人类、两栖类、爬行类、鸟类和高等哺乳动物咀嚼食物的器官。

关键词: 周岁 多少 牙齿

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