Retained dental root
英
美
- 保留牙根
双语例句
- The root is covered with a hard material called cementum.
牙根上覆盖着的坚硬材料叫作牙骨质。 - In truth, both root development and the stimuli that initiate tooth eruption are complex and still little understood.
事实上，牙根的发育以及让牙齿冒出的刺激都很复杂，目前知道得很少。
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