oligochaete

例句：

1. 1.The oligochaetes are tiny, but they play a crucial role in the ecosystem.
   寡毛目动物很小，但它们在生态系统中起着至关重要的作用。
2. 2. The oligochaetes were found in the mud and sand of the riverbed.
   寡毛目动物被发现存在于河床的泥和沙中。
3. 3.The oligochaetes are known for their ability to survive in extreme conditions.
   寡毛目动物因其在极端条件下的生存能力而闻名。