bulla

例句：

1. 1.The bulla on the animal's head is a symbol of its strength.
   动物头上的牛角是其力量的象征。
2. 2.The bulla was carved into intricate designs by skilled artisans.
   牛角被熟练的工匠雕刻成复杂的图案。
3. 3. The bulla was used as a weapon in ancient warfare.
   在古代战争中，牛角曾被用作武器。