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    Summary

    牙是人体最坚硬的器官,嵌入上、下颌骨牙槽内,分别排列成上牙弓和下牙弓。可咬切和磨碎食物,并对发音有辅助作用。

    Language:
    中文-普通话 國語
    Words:
    1,352
    Chapters:
    1/1
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