Mollusca

例句：

1. 1. Mollusca are a diverse group of animals that include snails and slugs.
   软体动物是一个多样化的群体，包括蜗牛和蛞蝓。
2. 2. The mollusca exhibit various adaptations to their environment.
   软体动物展示了它们适应环境的多种方式。
3. 3.In the ocean, mollusca play an important role in decomposition and nutrient cycling.
   在海洋中，软体动物在分解和营养循环中起着重要作用。