贝壳

例句：

1. 1. The shell is a symbol of protection and strength.
   贝壳是保护和力量的象征。
2. 2. The oyster is a popular delicacy in many Asian countries.
   牡蛎是许多亚洲国家受欢迎的美食。
3. 3. Clams are commonly found in the ocean and can be used for food or medicine.
   蛤蜊通常在海洋中被发现，可以用于食物或药物。