同根派生 permanent tooth相关词英汉例句用作名詞 (n.)The exfoliation of the deciduous teeth is mainly brought about by resorption of their roots and enhances by growth and eruption of the succeeding permanent teeth.縂而官之，乳牙之所以會脫落主要在於它們的根部會發生吸收，而其下正在萌出的永久齒則增進了它在根部進行吸收的工作。permanent tooth更多例句