biconical horn

例句：

1. 1. The ancient tree is home to a biconical horn that has been there for centuries.
   这棵古老的树是一只双头管状物，它已经在那里存在了几个世纪了。
2. 2.The biconical horn was used as a tool by early humans to shape wood.
   双头管状物被早期人类用作工具，用来雕刻木材。
3. 3.The biconical horn is a unique feature of the animal's anatomy and helps it navigate through the forest.
   双头管状物是这种动物解剖学的独特特征，帮助它穿越森林。