crocodylinae

例句：

1. 1. The crocodile's tooth is a unique feature of its jaw structure.
   鳄鱼的牙齿是其颌结构的独特特征。
2. 2. The crocodile's tooth is used to catch and eat prey.
   鳄鱼的牙齿用于捕捉和吃掉猎物。
3. 3. The crocodile's tooth is also used as a tool for hunting and defense.
   鳄鱼的牙齿也用作狩猎和防御的工具。