bastard animal
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骡子是公驴和母马交配而生的杂种动物。
A mule is a hybrid of a male donkey and a female horse.
《牛津词典》
材料与方法 健康杂种家猪20只，雄性9只，雌性11只，行胆总管结扎，建立梗阻性黄疸动物模型。
Materials and Methods 20 cases of local , healthy, crossbred pigs , including 9 males and 11 females , their common bile ducts were ligated.
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