Biflagellatae

例句：

1. 1. The study of the flagellate bacterium is important for understanding how cells move through water.
   研究鞭毛细菌对于理解细胞在水中移动的方式非常重要。
2. 2. The biflagellate algae are found in freshwater habitats and play a crucial role in nutrient cycling.
   鞭毛藻类存在于淡水栖息地，并在营养物质循环中扮演着关键角色。
3. 3. In this study, we focused on the biflagellate protozoa as they are often overlooked in environmental research.
   在本研究中，我们专注于鞭毛原虫，因为它们在环境研究中经常被忽视。