Retained dental root

英 美
  • 保留牙根
  • dental adj.牙齿的;牙科的
  • retained vt.保持;保留;记住;聘请
  • root n.根;根源;根本v.生根;扎根;根除
    1. 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。
    2. 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。