1. Any of various segmented worms, especially of the genera Nereis and Arenicola, generally inhabiting coastal mud or sand and often used as fishing bait.
任一种分节的蠕虫，尤指沙蚕属和沙蠕属的蠕虫，通常居于海滨泥沙处，并被用作鱼饵。
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2. Any of various segmented worms, especially of the genera Nereis and Arenicola, generally inhabiting coastal mud or sand and often used as fishing bait.
任一种分节的蠕虫，尤指沙蚕属和沙蠕属的蠕虫，通常居于海滨泥沙处，并被用作鱼饵。
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用作名词 (n.)
Describe the excretory system of the genus Nereis briefly. 请简述沙蚕属的排泄系统。
