permanent tooth

同根派生

• permanent tooth相關(guān)詞

英漢例句

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.
  總而官之，乳牙之所以會(huì)脫落主要在于它們的根部會(huì)發(fā)生吸收，而其下正在萌出的永久齒則增進(jìn)了它在根部進(jìn)行吸收的工作。

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