coronal cementum

例句：

1. 1.The crown cementum is the outermost layer of the tooth.
   冠状牙釉质是牙齿的最外层。
2. 2.The crown cementum is responsible for protecting the tooth from damage.
   冠状牙釉质负责保护牙齿免受损伤。
3. 3. The crown cementum is also important for maintaining good oral health.
   冠状牙釉质对于保持良好的口腔健康也是非常重要的。