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恒齿
释义
恒齿héngchǐ[permanent tooth] 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
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public security
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public-spiritd
public-spirited
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public survey
public switched network
public switched telephone network
public telephone network
public television
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更新时间:2026/6/5 23:21:32