A mule is a hybrid of a male donkey and a female horse.
骡子是公驴和母马交配而生的杂种动物。
In the grammatical sense, this word is the means or principal of predication whereby we say one thing is another thing: the mare is the female of the horse, for example.
从语法的角度来看，is这个词是，我们声明一个东西是另一个东西的方式或者？委托：，例如说，母马是马中的雌性。
马是白色.
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