primary aquatic plant

例句：

1. 1. The primary aquatic plants in the lake are diatoms and algae.
   湖中的初级水生植物是藻类和硅藻。
2. 2. Aquatic plants play an important role in maintaining water quality.
   水生植物在保持水质方面起着重要作用。
3. 3. The study of aquatic plants is crucial for understanding the ecosystem.
   研究水生植物对于理解生态系统至关重要。