常见例句用作名词 (n.)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。These findings may contribute to the development of a periodontal treatment that includes cementum regeneration.这些结果可以有助于牙周治疗的发展，包括牙骨质的再生。 返回 cementum