Osteichthyes

例句：

1. 1. Osteichthyes are a group offish that have a hard skeleton.
   硬骨鱼纲是一类有硬骨骼的鱼类。
2. 2. The Osteichthyes are found in all five oceansaround the world.
   硬骨鱼纲分布在全球五大海洋中。
3. 3. Osteichthyes play an important role in maintaining thebalance of marine ecosystems.
   硬骨鱼纲在维持海洋生态系统平衡中起着重要作用。