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恆齒
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恆齒
héng chǐ
哺乳动物的第二套牙齿,在乳牙之后出现,典型的恒齿一直存留到老年。人类的恒齿共32颗,上下颌各有4颗切齿、2颗犬齿、10颗前臼齿和臼齿permanent tooth
恒齿
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更新时间：2026/8/26 21:30:27