Unio

常見例句

• 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，發(fā)現(xiàn)于美國(guó)中部的無齒貝屬和珠蚌屬幾種淡水雙殼軟體動(dòng)物的一種，在湖和河中的沙中或泥中挖洞。
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