Cyanophyta

例句：

1. 1. The cyanobacteria are a type of photosynthetic bacteria that can survive in extreme environments.
   蓝藻是一种能在极端环境中生存的光合细菌。
2. 2. Blue-green algae are common in freshwater ecosystems and play important roles in nutrient cycling.
   蓝绿藻常见于淡水生态系统，对养分循环起着重要作用。
3. 3. Cyanobacteria are often used as indicators of water quality due to their sensitivity to pollutants.
   由于对污染物的高度敏感性，蓝藻常被用作水质指示物。