scaletail

例句：

1. 1.The fish had a scaletail that was longer than its body.
   这条鱼有一个比身体还长的尾刺。
2. 2.The shark's scaletail is used to catch prey.
   鲨鱼的尾刺用来捕捉猎物。
3. 3. The dolphin has a unique scaletail that helps it swim efficiently.
   海豚有一个独特的尾刺，有助于它高效游泳。