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Any of several freshwater bivalve mollusks of the genera Anodonta and Unio,found in the central United States,that burrow in the sand or mud of lakes and streams. 淡水蚌，发现于美国中部的无齿贝属和珠蚌属几种淡水双壳软体动物的一种，在湖和河中的沙中或泥中挖洞。