Tetrabranchia

例句：

1. 1. The river flows through a beautiful valley with four branches.
   这条河流穿过一个美丽的山谷，有四条支流。
2. 2. The tetrabranchia system is responsible for the distribution of nutrients throughout the ecosystem.
   四分支系统负责在整个生态系统中分配营养物质。
3. 3. The tetrabranchia system plays a crucial role in maintaining the balance of the ecosystem.
   四分支系统在维护生态系统平衡方面起着至关重要的作用。