upper incisor form

• 切牙形

upper incisor form的用法和样例：

例句

1. The conodonts studied in this paper were collected from the black shales ofthe Llanvirnian Upper Ningguo Formation.
   本文研究了江西武宁奥陶系宁国组上部黑色页岩中的牙形刺。