bidiscoidal

例句：

1. 1. The oyster is a member of the bivalve family.
   牡蛎是双壳纲家族的成员。
2. 2.The bivalve mollusks are found in many coastal areas.
   双壳纲软体动物在许多沿海地区都有发现。
3. 3. Bivalve mollusks are known for their hard shells and ability to survive in saltwater.
   双壳纲软体动物以其坚硬的外壳和在盐水中生存的能力而闻名。